139738690 has 48 divisors (see below), whose sum is σ = 315117432. Its totient is φ = 44222976.

The previous prime is 139738681. The next prime is 139738693. The reversal of 139738690 is 96837931.

It can be written as a sum of positive squares in 4 ways, for example, as 61575409 + 78163281 = 7847^2 + 8841^2 .

It is a super-2 number, since 2×139738690² = 39053802965832200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139738690.

It is not an unprimeable number, because it can be changed into a prime (139738693) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4599 + ... + 17338.

Almost surely, 2^139738690 is an apocalyptic number.

139738690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139738690 is an abundant number, since it is smaller than the sum of its proper divisors (175378742).

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

139738690 is a wasteful number, since it uses less digits than its factorization.

139738690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21971 (or 21964 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 139738690 is about 11821.1120458272. The cubic root of 139738690 is about 518.9261493048.

The spelling of 139738690 in words is "one hundred thirty-nine million, seven hundred thirty-eight thousand, six hundred ninety".