139428864 has 165 divisors, whose sum is σ = 426764701. Its totient is φ = 45342720.

The previous prime is 139428857. The next prime is 139428889. The reversal of 139428864 is 468824931.

It is a happy number.

The square root of 139428864 is 11808.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6718464 + 132710400 = 2592^2 + 11520^2 .

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3400684 + ... + 3400724.

Almost surely, 2^139428864 is an apocalyptic number.

139428864 is the 11808-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139428864

139428864 is an abundant number, since it is smaller than the sum of its proper divisors (287335837).

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

139428864 is an frugal number, since it uses more digits than its factorization.

139428864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 46 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The cubic root of 139428864 is about 518.5423477404.

Multiplying 139428864 by its product of digits (331776), we get a square (46259150782464 = 6801408²).

The spelling of 139428864 in words is "one hundred thirty-nine million, four hundred twenty-eight thousand, eight hundred sixty-four".