138952785 has 16 divisors (see below), whose sum is σ = 222497856. Its totient is φ = 74050368.

The previous prime is 138952777. The next prime is 138952817. The reversal of 138952785 is 587259831.

138952785 is a nontrivial binomial coefficient, being equal to C(16671, 2).

It is not a de Polignac number, because 138952785 - 2³ = 138952777 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22227 + ... + 27783.

It is an arithmetic number, because the mean of its divisors is an integer number (13906116).

Almost surely, 2^138952785 is an apocalyptic number.

138952785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138952785 is the 16670-th triangular number.

It is an amenable number.

138952785 is a deficient number, since it is larger than the sum of its proper divisors (83545071).

138952785 is a wasteful number, since it uses less digits than its factorization.

138952785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7232.

The product of its digits is 604800, while the sum is 48.

The square root of 138952785 is about 11787.8235904683. The cubic root of 138952785 is about 517.9514881796.

The spelling of 138952785 in words is "one hundred thirty-eight million, nine hundred fifty-two thousand, seven hundred eighty-five".