138700649 has 8 divisors (see below), whose sum is σ = 149722560. Its totient is φ = 128094736.

The previous prime is 138700567. The next prime is 138700651. The reversal of 138700649 is 946007831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138700649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138700669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103307 + ... + 104640.

It is an arithmetic number, because the mean of its divisors is an integer number (18715320).

Almost surely, 2^138700649 is an apocalyptic number.

It is an amenable number.

138700649 is a deficient number, since it is larger than the sum of its proper divisors (11021911).

138700649 is a wasteful number, since it uses less digits than its factorization.

138700649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207999.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 138700649 is about 11777.1239697984. The cubic root of 138700649 is about 517.6380165069.

The spelling of 138700649 in words is "one hundred thirty-eight million, seven hundred thousand, six hundred forty-nine".