138141815 has 16 divisors (see below), whose sum is σ = 191227392. Its totient is φ = 93837984.

The previous prime is 138141811. The next prime is 138141821. The reversal of 138141815 is 518141831.

It is a cyclic number.

It is not a de Polignac number, because 138141815 - 2² = 138141811 is a prime.

It is a super-2 number, since 2×138141815² = 38166322102988450, 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 (138141811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14699 + ... + 22188.

It is an arithmetic number, because the mean of its divisors is an integer number (11951712).

Almost surely, 2^138141815 is an apocalyptic number.

138141815 is a deficient number, since it is larger than the sum of its proper divisors (53085577).

138141815 is a wasteful number, since it uses less digits than its factorization.

138141815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37006.

The product of its digits is 3840, while the sum is 32.

The square root of 138141815 is about 11753.3746217842. The cubic root of 138141815 is about 516.9418815855.

The spelling of 138141815 in words is "one hundred thirty-eight million, one hundred forty-one thousand, eight hundred fifteen".