138699406 has 8 divisors (see below), whose sum is σ = 208101960. Its totient is φ = 69332088.

The previous prime is 138699371. The next prime is 138699439. The reversal of 138699406 is 604996831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6040 + ... + 17716.

It is an arithmetic number, because the mean of its divisors is an integer number (26012745).

Almost surely, 2^138699406 is an apocalyptic number.

138699406 is a deficient number, since it is larger than the sum of its proper divisors (69402554).

138699406 is a wasteful number, since it uses less digits than its factorization.

138699406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17618.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 138699406 is about 11777.0711978828. The cubic root of 138699406 is about 517.6364701888.

The spelling of 138699406 in words is "one hundred thirty-eight million, six hundred ninety-nine thousand, four hundred six".