139666512 has 40 divisors (see below), whose sum is σ = 361651456. Its totient is φ = 46446336.

The previous prime is 139666487. The next prime is 139666589. The reversal of 139666512 is 215666931.

It is a super-2 number, since 2×139666512² = 39013469148492288, 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 7 ways as a sum of consecutive naturals, for example, 18753 + ... + 25119.

Almost surely, 2^139666512 is an apocalyptic number.

139666512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

139666512 is an abundant number, since it is smaller than the sum of its proper divisors (221984944).

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

139666512 is a wasteful number, since it uses less digits than its factorization.

139666512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6835 (or 6829 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 139666512 is about 11818.0587238345. The cubic root of 139666512 is about 518.8367884598.

The spelling of 139666512 in words is "one hundred thirty-nine million, six hundred sixty-six thousand, five hundred twelve".