252321406 has 16 divisors (see below), whose sum is σ = 405158400. Its totient is φ = 117493848.

The previous prime is 252321403. The next prime is 252321409. The reversal of 252321406 is 604123252.

It is an interprime number because it is at equal distance from previous prime (252321403) and next prime (252321409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252321403) 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, 54030 + ... + 58513.

It is an arithmetic number, because the mean of its divisors is an integer number (25322400).

Almost surely, 2^252321406 is an apocalyptic number.

252321406 is a deficient number, since it is larger than the sum of its proper divisors (152836994).

252321406 is a wasteful number, since it uses less digits than its factorization.

252321406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112623.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 252321406 is about 15884.6279780170. The cubic root of 252321406 is about 631.9043795275.

Adding to 252321406 its reverse (604123252), we get a palindrome (856444658).

The spelling of 252321406 in words is "two hundred fifty-two million, three hundred twenty-one thousand, four hundred six".