138408490 has 64 divisors (see below), whose sum is σ = 288396288. Its totient is φ = 47347200.

The previous prime is 138408461. The next prime is 138408539. The reversal of 138408490 is 94804831.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125622 + ... + 126718.

It is an arithmetic number, because the mean of its divisors is an integer number (4506192).

Almost surely, 2^138408490 is an apocalyptic number.

138408490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138408490 is an abundant number, since it is smaller than the sum of its proper divisors (149987798).

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

138408490 is a wasteful number, since it uses less digits than its factorization.

138408490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 138408490 is about 11764.7137661738. The cubic root of 138408490 is about 517.2743101695.

The spelling of 138408490 in words is "one hundred thirty-eight million, four hundred eight thousand, four hundred ninety".