139818409929 has 63 divisors (see below), whose sum is σ = 230604804829. Its totient is φ = 84671124120.

The previous prime is 139818409889. The next prime is 139818409963. The reversal of 139818409929 is 929904818931.

The square root of 139818409929 is 373923.

It is a perfect power (a square), and thus also a powerful number.

139818409929 is a `hidden beast` number, since 139 + 8 + 1 + 8 + 409 + 92 + 9 = 666.

It is not a de Polignac number, because 139818409929 - 2¹¹ = 139818407881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139818409999) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 111054502 + ... + 111055760.

Almost surely, 2^139818409929 is an apocalyptic number.

139818409929 is the 373923-rd square number.

139818409929 is the 186962-nd centered octagonal number.

It is an amenable number.

139818409929 is a deficient number, since it is larger than the sum of its proper divisors (90786394900).

139818409929 is an frugal number, since it uses more digits than its factorization.

139818409929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558 (or 1273 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 139818409929 in words is "one hundred thirty-nine billion, eight hundred eighteen million, four hundred nine thousand, nine hundred twenty-nine".