139215930 has 64 divisors (see below), whose sum is σ = 382814208. Its totient is φ = 31740480.

The previous prime is 139215919. The next prime is 139215931. The reversal of 139215930 is 39512931.

It is a junction number, because it is equal to n+sod(n) for n = 139215891 and 139215900.

It is not an unprimeable number, because it can be changed into a prime (139215931) 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, 134515 + ... + 135545.

It is an arithmetic number, because the mean of its divisors is an integer number (5981472).

Almost surely, 2^139215930 is an apocalyptic number.

139215930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139215930 is an abundant number, since it is smaller than the sum of its proper divisors (243598278).

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

139215930 is a wasteful number, since it uses less digits than its factorization.

139215930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 139215930 is about 11798.9800406645. The cubic root of 139215930 is about 518.2782428075.

The spelling of 139215930 in words is "one hundred thirty-nine million, two hundred fifteen thousand, nine hundred thirty".