139897920 has 112 divisors (see below), whose sum is σ = 454639680. Its totient is φ = 36427776.

The previous prime is 139897889. The next prime is 139897957. The reversal of 139897920 is 29798931.

139897920 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 139897920.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39586 + ... + 42974.

Almost surely, 2^139897920 is an apocalyptic number.

139897920 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 139897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227319840).

139897920 is an abundant number, since it is smaller than the sum of its proper divisors (314741760).

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

139897920 is a wasteful number, since it uses less digits than its factorization.

139897920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452 (or 3442 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 139897920 is about 11827.8451122764. The cubic root of 139897920 is about 519.1231771667.

The spelling of 139897920 in words is "one hundred thirty-nine million, eight hundred ninety-seven thousand, nine hundred twenty".