207138824 has 8 divisors (see below), whose sum is σ = 388385310. Its totient is φ = 103569408.

The previous prime is 207138809. The next prime is 207138853. The reversal of 207138824 is 428831702.

It can be written as a sum of positive squares in only one way, i.e., 165122500 + 42016324 = 12850^2 + 6482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12946169 + ... + 12946184.

Almost surely, 2^207138824 is an apocalyptic number.

It is an amenable number.

207138824 is a deficient number, since it is larger than the sum of its proper divisors (181246486).

207138824 is a wasteful number, since it uses less digits than its factorization.

207138824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25892359 (or 25892355 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 207138824 is about 14392.3182288330. The cubic root of 207138824 is about 591.6803804884.

The spelling of 207138824 in words is "two hundred seven million, one hundred thirty-eight thousand, eight hundred twenty-four".