213723925 has 12 divisors (see below), whose sum is σ = 268650340. Its totient is φ = 168635520.

The previous prime is 213723919. The next prime is 213723929. The reversal of 213723925 is 529327312.

It can be written as a sum of positive squares in 6 ways, for example, as 11600836 + 202123089 = 3406^2 + 14217^2 .

It is a de Polignac number, because none of the positive numbers 2^k-213723925 is a prime.

It is a super-2 number, since 2×213723925² = 91355832234811250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213723929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56730 + ... + 60379.

Almost surely, 2^213723925 is an apocalyptic number.

213723925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213723925 is a deficient number, since it is larger than the sum of its proper divisors (54926415).

213723925 is a wasteful number, since it uses less digits than its factorization.

213723925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117192 (or 117187 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The square root of 213723925 is about 14619.2997438318. The cubic root of 213723925 is about 597.8850770756.

It can be divided in two parts, 2137 and 23925, that added together give a palindrome (26062).

The spelling of 213723925 in words is "two hundred thirteen million, seven hundred twenty-three thousand, nine hundred twenty-five".