139401388 has 24 divisors (see below), whose sum is σ = 280657664. Its totient is φ = 59346000.

The previous prime is 139401373. The next prime is 139401403. The reversal of 139401388 is 883104931.

It is an interprime number because it is at equal distance from previous prime (139401373) and next prime (139401403).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12258 + ... + 20713.

Almost surely, 2^139401388 is an apocalyptic number.

It is an amenable number.

139401388 is an abundant number, since it is smaller than the sum of its proper divisors (141256276).

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

139401388 is a wasteful number, since it uses less digits than its factorization.

139401388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33133 (or 33131 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 139401388 is about 11806.8364941673. The cubic root of 139401388 is about 518.5082840008.

The spelling of 139401388 in words is "one hundred thirty-nine million, four hundred one thousand, three hundred eighty-eight".