196139520 has 120 divisors (see below), whose sum is σ = 679366116. Its totient is φ = 52297728.

The previous prime is 196139513. The next prime is 196139521. The reversal of 196139520 is 25931691.

196139520 is a `hidden beast` number, since 19 + 613 + 9 + 5 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 184525056 + 11614464 = 13584^2 + 3408^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×196139520² = 76941422611660800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (196139521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18784 + ... + 27296.

Almost surely, 2^196139520 is an apocalyptic number.

196139520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 196139520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339683058).

196139520 is an abundant number, since it is smaller than the sum of its proper divisors (483226596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

196139520 is an equidigital number, since it uses as much as digits as its factorization.

196139520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542 (or 8523 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 196139520 is about 14004.9819707131. The cubic root of 196139520 is about 581.0163709007.

The spelling of 196139520 in words is "one hundred ninety-six million, one hundred thirty-nine thousand, five hundred twenty".