138461990 has 8 divisors (see below), whose sum is σ = 249231600. Its totient is φ = 55384792.

The previous prime is 138461989. The next prime is 138462007. The reversal of 138461990 is 99164831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6923090 + ... + 6923109.

It is an arithmetic number, because the mean of its divisors is an integer number (31153950).

Almost surely, 2^138461990 is an apocalyptic number.

138461990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138461990 is a deficient number, since it is larger than the sum of its proper divisors (110769610).

138461990 is a wasteful number, since it uses less digits than its factorization.

138461990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13846206.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 138461990 is about 11766.9872949706. The cubic root of 138461990 is about 517.3409501342.

The spelling of 138461990 in words is "one hundred thirty-eight million, four hundred sixty-one thousand, nine hundred ninety".