138449636 has 24 divisors (see below), whose sum is σ = 265352640. Its totient is φ = 62815392.

The previous prime is 138449629. The next prime is 138449657. The reversal of 138449636 is 636944831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19496 + ... + 25631.

It is an arithmetic number, because the mean of its divisors is an integer number (11056360).

Almost surely, 2^138449636 is an apocalyptic number.

It is an amenable number.

138449636 is a deficient number, since it is larger than the sum of its proper divisors (126903004).

138449636 is a wasteful number, since it uses less digits than its factorization.

138449636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45203 (or 45201 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The square root of 138449636 is about 11766.4623400579. The cubic root of 138449636 is about 517.3255634321.

The spelling of 138449636 in words is "one hundred thirty-eight million, four hundred forty-nine thousand, six hundred thirty-six".