139504388 has 6 divisors (see below), whose sum is σ = 244132686. Its totient is φ = 69752192.

The previous prime is 139504381. The next prime is 139504399. The reversal of 139504388 is 883405931.

It can be written as a sum of positive squares in only one way, i.e., 118417924 + 21086464 = 10882^2 + 4592^2 .

It is a super-3 number, since 3×139504388³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (139504381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17438045 + ... + 17438052.

It is an arithmetic number, because the mean of its divisors is an integer number (40688781).

Almost surely, 2^139504388 is an apocalyptic number.

It is an amenable number.

139504388 is a deficient number, since it is larger than the sum of its proper divisors (104628298).

139504388 is a wasteful number, since it uses less digits than its factorization.

139504388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34876101 (or 34876099 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 139504388 is about 11811.1975684094. The cubic root of 139504388 is about 518.6359565821.

The spelling of 139504388 in words is "one hundred thirty-nine million, five hundred four thousand, three hundred eighty-eight".