138507190 has 32 divisors (see below), whose sum is σ = 260470080. Its totient is φ = 52961664.

The previous prime is 138507181. The next prime is 138507191. The reversal of 138507190 is 91705831.

It is a happy number.

It is a super-2 number, since 2×138507190² = 38368483363392200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138507191) 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, 27552 + ... + 32188.

It is an arithmetic number, because the mean of its divisors is an integer number (8139690).

Almost surely, 2^138507190 is an apocalyptic number.

138507190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138507190 is a deficient number, since it is larger than the sum of its proper divisors (121962890).

138507190 is a wasteful number, since it uses less digits than its factorization.

138507190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 138507190 is about 11768.9077658039. The cubic root of 138507190 is about 517.3972381858.

The spelling of 138507190 in words is "one hundred thirty-eight million, five hundred seven thousand, one hundred ninety".