138890276 has 12 divisors (see below), whose sum is σ = 277780608. Its totient is φ = 59524392.

The previous prime is 138890273. The next prime is 138890287. The reversal of 138890276 is 672098831.

138890276 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138890273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2480156 + ... + 2480211.

It is an arithmetic number, because the mean of its divisors is an integer number (23148384).

Almost surely, 2^138890276 is an apocalyptic number.

It is an amenable number.

138890276 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138890276 is a wasteful number, since it uses less digits than its factorization.

138890276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960378 (or 4960376 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 138890276 is about 11785.1718697692. The cubic root of 138890276 is about 517.8738083506.

The spelling of 138890276 in words is "one hundred thirty-eight million, eight hundred ninety thousand, two hundred seventy-six".