138666190 has 24 divisors (see below), whose sum is σ = 270279288. Its totient is φ = 51199200.

The previous prime is 138666181. The next prime is 138666211. The reversal of 138666190 is 91666831.

It is a super-2 number, since 2×138666190² = 38456624498232200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39336 + ... + 42715.

It is an arithmetic number, because the mean of its divisors is an integer number (11261637).

Almost surely, 2^138666190 is an apocalyptic number.

138666190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138666190 is a deficient number, since it is larger than the sum of its proper divisors (131613098).

138666190 is a wasteful number, since it uses less digits than its factorization.

138666190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82084 (or 82071 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 138666190 is about 11775.6609156344. The cubic root of 138666190 is about 517.5951453646.

It can be divided in two parts, 1386 and 66190, that added together give a palindrome (67576).

The spelling of 138666190 in words is "one hundred thirty-eight million, six hundred sixty-six thousand, one hundred ninety".