623440233 has 20 divisors (see below), whose sum is σ = 1002953028. Its totient is φ = 383654880.

The previous prime is 623440229. The next prime is 623440247. The reversal of 623440233 is 332044326.

It is a happy number.

623440233 is a `hidden beast` number, since 623 + 4 + 4 + 0 + 2 + 33 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 64448784 + 558991449 = 8028^2 + 23643^2 .

It is not a de Polignac number, because 623440233 - 2² = 623440229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 623440197 and 623440206.

It is not an unprimeable number, because it can be changed into a prime (623440253) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 294978 + ... + 297083.

Almost surely, 2^623440233 is an apocalyptic number.

It is an amenable number.

623440233 is a deficient number, since it is larger than the sum of its proper divisors (379512795).

623440233 is a wasteful number, since it uses less digits than its factorization.

623440233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592086 (or 592077 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

The square root of 623440233 is about 24968.7851726911. The cubic root of 623440233 is about 854.2761371029.

Adding to 623440233 its reverse (332044326), we get a palindrome (955484559).

The spelling of 623440233 in words is "six hundred twenty-three million, four hundred forty thousand, two hundred thirty-three".