252438643 has 4 divisors (see below), whose sum is σ = 252647968. Its totient is φ = 252229320.

The previous prime is 252438623. The next prime is 252438671. The reversal of 252438643 is 346834252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252438643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252438623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102843 + ... + 105268.

It is an arithmetic number, because the mean of its divisors is an integer number (63161992).

Almost surely, 2^252438643 is an apocalyptic number.

252438643 is a deficient number, since it is larger than the sum of its proper divisors (209325).

252438643 is a wasteful number, since it uses less digits than its factorization.

252438643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209324.

The product of its digits is 138240, while the sum is 37.

The square root of 252438643 is about 15888.3178153006. The cubic root of 252438643 is about 632.0022323734.

The spelling of 252438643 in words is "two hundred fifty-two million, four hundred thirty-eight thousand, six hundred forty-three".