138776415 has 16 divisors (see below), whose sum is σ = 224719488. Its totient is φ = 73121696.

The previous prime is 138776413. The next prime is 138776447. The reversal of 138776415 is 514677831.

It is a cyclic number.

It is not a de Polignac number, because 138776415 - 2¹ = 138776413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138776413) 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, 54489 + ... + 56978.

It is an arithmetic number, because the mean of its divisors is an integer number (14044968).

Almost surely, 2^138776415 is an apocalyptic number.

138776415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138776415 is a deficient number, since it is larger than the sum of its proper divisors (85943073).

138776415 is a wasteful number, since it uses less digits than its factorization.

138776415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111558.

The product of its digits is 141120, while the sum is 42.

The square root of 138776415 is about 11780.3401903341. The cubic root of 138776415 is about 517.7322535639.

The spelling of 138776415 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, four hundred fifteen".