138461490 has 24 divisors (see below), whose sum is σ = 360000108. Its totient is φ = 36923040.

The previous prime is 138461473. The next prime is 138461503. The reversal of 138461490 is 94164831.

138461490 is a `hidden beast` number, since 1 + 38 + 4 + 614 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 137522529 + 938961 = 11727^2 + 969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 769141 + ... + 769320.

Almost surely, 2^138461490 is an apocalyptic number.

138461490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138461490 is an abundant number, since it is smaller than the sum of its proper divisors (221538618).

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

138461490 is a wasteful number, since it uses less digits than its factorization.

138461490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538474 (or 1538471 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 138461490 is about 11766.9660490714. The cubic root of 138461490 is about 517.3403274103.

The spelling of 138461490 in words is "one hundred thirty-eight million, four hundred sixty-one thousand, four hundred ninety".