138924490 has 32 divisors (see below), whose sum is σ = 253984896. Its totient is φ = 54705600.

The previous prime is 138924481. The next prime is 138924497. The reversal of 138924490 is 94429831.

It is not an unprimeable number, because it can be changed into a prime (138924497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265369 + ... + 265891.

It is an arithmetic number, because the mean of its divisors is an integer number (7937028).

Almost surely, 2^138924490 is an apocalyptic number.

138924490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138924490 is a deficient number, since it is larger than the sum of its proper divisors (115060406).

138924490 is a wasteful number, since it uses less digits than its factorization.

138924490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 138924490 is about 11786.6233502221. The cubic root of 138924490 is about 517.9163289174.

The spelling of 138924490 in words is "one hundred thirty-eight million, nine hundred twenty-four thousand, four hundred ninety".