623440234 has 4 divisors (see below), whose sum is σ = 935160354. Its totient is φ = 311720116.

The previous prime is 623440229. The next prime is 623440247. The reversal of 623440234 is 432044326.

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

It can be written as a sum of positive squares in only one way, i.e., 447957225 + 175483009 = 21165^2 + 13247^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155860057 + ... + 155860060.

Almost surely, 2^623440234 is an apocalyptic number.

623440234 is a deficient number, since it is larger than the sum of its proper divisors (311720120).

623440234 is a wasteful number, since it uses less digits than its factorization.

623440234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311720119.

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 623440234 is about 24968.7851927161. The cubic root of 623440234 is about 854.2761375597.

The spelling of 623440234 in words is "six hundred twenty-three million, four hundred forty thousand, two hundred thirty-four".