139961664 has 42 divisors (see below), whose sum is σ = 401176490. Its totient is φ = 46653696.

The previous prime is 139961641. The next prime is 139961719. The reversal of 139961664 is 466169931.

It can be written as a sum of positive squares in only one way, i.e., 72590400 + 67371264 = 8520^2 + 8208^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120919 + ... + 122070.

Almost surely, 2^139961664 is an apocalyptic number.

It is an amenable number.

139961664 is an abundant number, since it is smaller than the sum of its proper divisors (261214826).

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

139961664 is a wasteful number, since it uses less digits than its factorization.

139961664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243007 (or 242994 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 139961664 is about 11830.5394636086. The cubic root of 139961664 is about 519.2020107503.

It can be divided in two parts, 139961 and 664, that added together give a square (140625 = 375²).

The spelling of 139961664 in words is "one hundred thirty-nine million, nine hundred sixty-one thousand, six hundred sixty-four".