139518729 has 36 divisors (see below), whose sum is σ = 246782640. Its totient is φ = 75524400.

The previous prime is 139518707. The next prime is 139518761. The reversal of 139518729 is 927815931.

It is not a de Polignac number, because 139518729 - 2⁵ = 139518697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139518829) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54 + ... + 16704.

Almost surely, 2^139518729 is an apocalyptic number.

139518729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

139518729 is a deficient number, since it is larger than the sum of its proper divisors (107263911).

139518729 is a wasteful number, since it uses less digits than its factorization.

139518729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16690 (or 16680 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 139518729 is about 11811.8046462003. The cubic root of 139518729 is about 518.6537278353.

The spelling of 139518729 in words is "one hundred thirty-nine million, five hundred eighteen thousand, seven hundred twenty-nine".