139415418 has 28 divisors (see below), whose sum is σ = 313544538. Its totient is φ = 46471320.

The previous prime is 139415399. The next prime is 139415449. The reversal of 139415418 is 814514931.

It can be written as a sum of positive squares in only one way, i.e., 116057529 + 23357889 = 10773^2 + 4833^2 .

It is a super-2 number, since 2×139415418² = 38873317552229448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 46353 + ... + 49268.

Almost surely, 2^139415418 is an apocalyptic number.

139415418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

139415418 is an abundant number, since it is smaller than the sum of its proper divisors (174129120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139415418 is an frugal number, since it uses more digits than its factorization.

139415418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95641 (or 95626 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 139415418 is about 11807.4306265165. The cubic root of 139415418 is about 518.5256784407.

The spelling of 139415418 in words is "one hundred thirty-nine million, four hundred fifteen thousand, four hundred eighteen".