138717646 has 8 divisors (see below), whose sum is σ = 217123344. Its totient is φ = 66343200.

The previous prime is 138717641. The next prime is 138717647. The reversal of 138717646 is 646717831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138717641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507755 + ... + 1507846.

It is an arithmetic number, because the mean of its divisors is an integer number (27140418).

Almost surely, 2^138717646 is an apocalyptic number.

138717646 is a deficient number, since it is larger than the sum of its proper divisors (78405698).

138717646 is a wasteful number, since it uses less digits than its factorization.

138717646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015626.

The product of its digits is 169344, while the sum is 43.

The square root of 138717646 is about 11777.8455585052. The cubic root of 138717646 is about 517.6591602052.

The spelling of 138717646 in words is "one hundred thirty-eight million, seven hundred seventeen thousand, six hundred forty-six".