139718397 has 32 divisors (see below), whose sum is σ = 230307840. Its totient is φ = 73368000.

The previous prime is 139718387. The next prime is 139718407. The reversal of 139718397 is 793817931.

It is an interprime number because it is at equal distance from previous prime (139718387) and next prime (139718407).

It is not a de Polignac number, because 139718397 - 2²⁷ = 5500669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139718347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67504 + ... + 69542.

It is an arithmetic number, because the mean of its divisors is an integer number (7197120).

Almost surely, 2^139718397 is an apocalyptic number.

It is an amenable number.

139718397 is a deficient number, since it is larger than the sum of its proper divisors (90589443).

139718397 is a wasteful number, since it uses less digits than its factorization.

139718397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313.

The product of its digits is 285768, while the sum is 48.

The square root of 139718397 is about 11820.2536774809. The cubic root of 139718397 is about 518.9010284211.

The spelling of 139718397 in words is "one hundred thirty-nine million, seven hundred eighteen thousand, three hundred ninety-seven".