139666698 has 48 divisors (see below), whose sum is σ = 310239072. Its totient is φ = 45396000.

The previous prime is 139666693. The next prime is 139666699. The reversal of 139666698 is 896666931.

It is not an unprimeable number, because it can be changed into a prime (139666693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143353 + ... + 144323.

It is an arithmetic number, because the mean of its divisors is an integer number (6463314).

Almost surely, 2^139666698 is an apocalyptic number.

139666698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

139666698 is an abundant number, since it is smaller than the sum of its proper divisors (170572374).

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

139666698 is a wasteful number, since it uses less digits than its factorization.

139666698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171 (or 1168 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 139666698 is about 11818.0665931446. The cubic root of 139666698 is about 518.8370187789.

The spelling of 139666698 in words is "one hundred thirty-nine million, six hundred sixty-six thousand, six hundred ninety-eight".