138277615 has 16 divisors (see below), whose sum is σ = 192471552. Its totient is φ = 93402144.

The previous prime is 138277613. The next prime is 138277631. The reversal of 138277615 is 516772831.

It is a cyclic number.

It is not a de Polignac number, because 138277615 - 2¹ = 138277613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138277613) 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, 27139 + ... + 31828.

It is an arithmetic number, because the mean of its divisors is an integer number (12029472).

Almost surely, 2^138277615 is an apocalyptic number.

138277615 is a deficient number, since it is larger than the sum of its proper divisors (54193937).

138277615 is an equidigital number, since it uses as much as digits as its factorization.

138277615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59046.

The product of its digits is 70560, while the sum is 40.

The square root of 138277615 is about 11759.1502669198. The cubic root of 138277615 is about 517.1112189594. Note that the first 3 decimals are identical.

The spelling of 138277615 in words is "one hundred thirty-eight million, two hundred seventy-seven thousand, six hundred fifteen".