138973810 has 32 divisors (see below), whose sum is σ = 266405760. Its totient is φ = 52015872.

The previous prime is 138973787. The next prime is 138973811. The reversal of 138973810 is 18379831.

It is a super-2 number, since 2×138973810² = 38627439731832200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138973811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28147 + ... + 32713.

It is an arithmetic number, because the mean of its divisors is an integer number (8325180).

Almost surely, 2^138973810 is an apocalyptic number.

138973810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138973810 is a deficient number, since it is larger than the sum of its proper divisors (127431950).

138973810 is a wasteful number, since it uses less digits than its factorization.

138973810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 138973810 is about 11788.7153668243. The cubic root of 138973810 is about 517.9776106759.

The spelling of 138973810 in words is "one hundred thirty-eight million, nine hundred seventy-three thousand, eight hundred ten".