139979520 has 216 divisors, whose sum is σ = 502210800. Its totient is φ = 35954688.

The previous prime is 139979509. The next prime is 139979531. The reversal of 139979520 is 25979931.

It is a happy number.

139979520 is a `hidden beast` number, since 1 + 39 + 97 + 9 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (139979509) and next prime (139979531).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333871 + ... + 334289.

It is an arithmetic number, because the mean of its divisors is an integer number (2325050).

Almost surely, 2^139979520 is an apocalyptic number.

139979520 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 139979520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251105400).

139979520 is an abundant number, since it is smaller than the sum of its proper divisors (362231280).

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

139979520 is a wasteful number, since it uses less digits than its factorization.

139979520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 139979520 is about 11831.2940965898. The cubic root of 139979520 is about 519.2240893601.

The spelling of 139979520 in words is "one hundred thirty-nine million, nine hundred seventy-nine thousand, five hundred twenty".