623643401 has 4 divisors (see below), whose sum is σ = 629471952. Its totient is φ = 617814852.

The previous prime is 623643359. The next prime is 623643529. The reversal of 623643401 is 104346326.

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 a de Polignac number, because none of the positive numbers 2^k-623643401 is a prime.

It is a super-2 number, since 2×623643401² = 777862183221693602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623643001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2914115 + ... + 2914328.

It is an arithmetic number, because the mean of its divisors is an integer number (157367988).

Almost surely, 2^623643401 is an apocalyptic number.

It is an amenable number.

623643401 is a deficient number, since it is larger than the sum of its proper divisors (5828551).

623643401 is a wasteful number, since it uses less digits than its factorization.

623643401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5828550.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 623643401 is about 24972.8532811131. The cubic root of 623643401 is about 854.3689247859.

Adding to 623643401 its reverse (104346326), we get a palindrome (727989727).

It can be divided in two parts, 62 and 3643401, that added together give a palindrome (3643463).

The spelling of 623643401 in words is "six hundred twenty-three million, six hundred forty-three thousand, four hundred one".