139887720 has 96 divisors (see below), whose sum is σ = 519592320. Its totient is φ = 31973760.

The previous prime is 139887719. The next prime is 139887721. The reversal of 139887720 is 27788931.

It is an interprime number because it is at equal distance from previous prime (139887719) and next prime (139887721).

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

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (139887721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25236 + ... + 30275.

It is an arithmetic number, because the mean of its divisors is an integer number (5412420).

Almost surely, 2^139887720 is an apocalyptic number.

139887720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139887720 is an abundant number, since it is smaller than the sum of its proper divisors (379704600).

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

139887720 is a wasteful number, since it uses less digits than its factorization.

139887720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55535 (or 55528 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 139887720 is about 11827.4139185200. The cubic root of 139887720 is about 519.1105603837.

The spelling of 139887720 in words is "one hundred thirty-nine million, eight hundred eighty-seven thousand, seven hundred twenty".