623724397 has 4 divisors (see below), whose sum is σ = 624053376. Its totient is φ = 623395420.

The previous prime is 623724391. The next prime is 623724403. The reversal of 623724397 is 793427326.

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 an interprime number because it is at equal distance from previous prime (623724391) and next prime (623724403).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623724397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623724391) 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, 161629 + ... + 165442.

It is an arithmetic number, because the mean of its divisors is an integer number (156013344).

Almost surely, 2^623724397 is an apocalyptic number.

It is an amenable number.

623724397 is a deficient number, since it is larger than the sum of its proper divisors (328979).

623724397 is a wasteful number, since it uses less digits than its factorization.

623724397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328978.

The product of its digits is 381024, while the sum is 43.

The square root of 623724397 is about 24974.4749093950. The cubic root of 623724397 is about 854.4059103826.

The spelling of 623724397 in words is "six hundred twenty-three million, seven hundred twenty-four thousand, three hundred ninety-seven".