139504391 has 8 divisors (see below), whose sum is σ = 151194624. Its totient is φ = 127951200.

The previous prime is 139504381. The next prime is 139504399. The reversal of 139504391 is 193405931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139504391 - 2²⁶ = 72395527 is a prime.

It is a super-2 number, since 2×139504391² = 38922950216561762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139504399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32135 + ... + 36216.

It is an arithmetic number, because the mean of its divisors is an integer number (18899328).

Almost surely, 2^139504391 is an apocalyptic number.

139504391 is a deficient number, since it is larger than the sum of its proper divisors (11690233).

139504391 is a wasteful number, since it uses less digits than its factorization.

139504391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68521.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 139504391 is about 11811.1976954075. The cubic root of 139504391 is about 518.6359602998.

The spelling of 139504391 in words is "one hundred thirty-nine million, five hundred four thousand, three hundred ninety-one".