138407685 has 32 divisors (see below), whose sum is σ = 251045760. Its totient is φ = 64551168.

The previous prime is 138407671. The next prime is 138407699. The reversal of 138407685 is 586704831.

It is an interprime number because it is at equal distance from previous prime (138407671) and next prime (138407699).

It is not a de Polignac number, because 138407685 - 2¹³ = 138399493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14974 + ... + 22383.

It is an arithmetic number, because the mean of its divisors is an integer number (7845180).

Almost surely, 2^138407685 is an apocalyptic number.

138407685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138407685 is a deficient number, since it is larger than the sum of its proper divisors (112638075).

138407685 is a wasteful number, since it uses less digits than its factorization.

138407685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37397.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 138407685 is about 11764.6795536470. The cubic root of 138407685 is about 517.2733073249.

The spelling of 138407685 in words is "one hundred thirty-eight million, four hundred seven thousand, six hundred eighty-five".