139868520 has 256 divisors, whose sum is σ = 507617280. Its totient is φ = 30412800.

The previous prime is 139868501. The next prime is 139868539. The reversal of 139868520 is 25868931.

139868520 = 265² + 266² + ... + 759².

It is an interprime number because it is at equal distance from previous prime (139868501) and next prime (139868539).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 515985 + ... + 516255.

It is an arithmetic number, because the mean of its divisors is an integer number (1982880).

Almost surely, 2^139868520 is an apocalyptic number.

139868520 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 139868520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253808640).

139868520 is an abundant number, since it is smaller than the sum of its proper divisors (367748760).

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

139868520 is a wasteful number, since it uses less digits than its factorization.

139868520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 139868520 is about 11826.6022170360. The cubic root of 139868520 is about 519.0868094812.

The spelling of 139868520 in words is "one hundred thirty-nine million, eight hundred sixty-eight thousand, five hundred twenty".