623668393 has 4 divisors (see below), whose sum is σ = 623948688. Its totient is φ = 623388100.

The previous prime is 623668363. The next prime is 623668417. The reversal of 623668393 is 393866326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623668393 - 2²¹ = 621571241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623668303) 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, 136783 + ... + 141268.

It is an arithmetic number, because the mean of its divisors is an integer number (155987172).

Almost surely, 2^623668393 is an apocalyptic number.

It is an amenable number.

623668393 is a deficient number, since it is larger than the sum of its proper divisors (280295).

623668393 is a wasteful number, since it uses less digits than its factorization.

623668393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280294.

The product of its digits is 839808, while the sum is 46.

The square root of 623668393 is about 24973.3536594507. The cubic root of 623668393 is about 854.3803373458.

The spelling of 623668393 in words is "six hundred twenty-three million, six hundred sixty-eight thousand, three hundred ninety-three".