139849920 has 252 divisors, whose sum is σ = 560124864. Its totient is φ = 31933440.

The previous prime is 139849909. The next prime is 139849979. The reversal of 139849920 is 29948931.

139849920 is a `hidden beast` number, since 139 + 8 + 499 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 140625 + ... + 141615.

Almost surely, 2^139849920 is an apocalyptic number.

139849920 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 139849920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280062432).

139849920 is an abundant number, since it is smaller than the sum of its proper divisors (420274944).

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

139849920 is a wasteful number, since it uses less digits than its factorization.

139849920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 139849920 is about 11825.8158280941. The cubic root of 139849920 is about 519.0637987216.

The spelling of 139849920 in words is "one hundred thirty-nine million, eight hundred forty-nine thousand, nine hundred twenty".