138959650 has 12 divisors (see below), whose sum is σ = 258465042. Its totient is φ = 55583840.

The previous prime is 138959641. The next prime is 138959699. The reversal of 138959650 is 56959831.

It can be written as a sum of positive squares in 3 ways, for example, as 74943649 + 64016001 = 8657^2 + 8001^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138959650.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1389547 + ... + 1389646.

Almost surely, 2^138959650 is an apocalyptic number.

138959650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138959650 is a deficient number, since it is larger than the sum of its proper divisors (119505392).

138959650 is a wasteful number, since it uses less digits than its factorization.

138959650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779205 (or 2779200 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 138959650 is about 11788.1147771813. The cubic root of 138959650 is about 517.9600178837.

The spelling of 138959650 in words is "one hundred thirty-eight million, nine hundred fifty-nine thousand, six hundred fifty".