139224640 has 56 divisors (see below), whose sum is σ = 337825080. Its totient is φ = 54632448.

The previous prime is 139224607. The next prime is 139224649. The reversal of 139224640 is 46422931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4293184 + 134931456 = 2072^2 + 11616^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139224649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12856 + ... + 21064.

Almost surely, 2^139224640 is an apocalyptic number.

139224640 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 139224640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168912540).

139224640 is an abundant number, since it is smaller than the sum of its proper divisors (198600440).

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

139224640 is an equidigital number, since it uses as much as digits as its factorization.

139224640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8279 (or 8269 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 139224640 is about 11799.3491345921. The cubic root of 139224640 is about 518.2890512194.

The spelling of 139224640 in words is "one hundred thirty-nine million, two hundred twenty-four thousand, six hundred forty".