138491015 has 8 divisors (see below), whose sum is σ = 178973088. Its totient is φ = 102270240.

The previous prime is 138491011. The next prime is 138491033. The reversal of 138491015 is 510194831.

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

It is not a de Polignac number, because 138491015 - 2² = 138491011 is a prime.

It is a super-2 number, since 2×138491015² = 38359522471460450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138491011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065251 + ... + 1065380.

It is an arithmetic number, because the mean of its divisors is an integer number (22371636).

Almost surely, 2^138491015 is an apocalyptic number.

138491015 is a deficient number, since it is larger than the sum of its proper divisors (40482073).

138491015 is a wasteful number, since it uses less digits than its factorization.

138491015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130649.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 138491015 is about 11768.2205536776. The cubic root of 138491015 is about 517.3770966896.

The spelling of 138491015 in words is "one hundred thirty-eight million, four hundred ninety-one thousand, fifteen".