138944268 has 24 divisors (see below), whose sum is σ = 360226160. Its totient is φ = 46314720.

The previous prime is 138944257. The next prime is 138944279. The reversal of 138944268 is 862449831.

It is a happy number.

138944268 is a `hidden beast` number, since 1 + 389 + 4 + 4 + 268 = 666.

It is an interprime number because it is at equal distance from previous prime (138944257) and next prime (138944279).

It is a super-2 number, since 2×138944268² = 38611019220111648, which contains 22 as substring.

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, 643153 + ... + 643368.

Almost surely, 2^138944268 is an apocalyptic number.

138944268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138944268 is an abundant number, since it is smaller than the sum of its proper divisors (221281892).

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

138944268 is a wasteful number, since it uses less digits than its factorization.

138944268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286534 (or 1286526 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 138944268 is about 11787.4623223152. The cubic root of 138944268 is about 517.9409054891.

The spelling of 138944268 in words is "one hundred thirty-eight million, nine hundred forty-four thousand, two hundred sixty-eight".