623421403 has 12 divisors (see below), whose sum is σ = 696490144. Its totient is φ = 557449200.

The previous prime is 623421401. The next prime is 623421437. The reversal of 623421403 is 304124326.

It is not a de Polignac number, because 623421403 - 2¹ = 623421401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623421401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34851 + ... + 49612.

Almost surely, 2^623421403 is an apocalyptic number.

623421403 is a deficient number, since it is larger than the sum of its proper divisors (73068741).

623421403 is a wasteful number, since it uses less digits than its factorization.

623421403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84546 (or 84535 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 623421403 is about 24968.4080990359. The cubic root of 623421403 is about 854.2675363418.

Adding to 623421403 its reverse (304124326), we get a palindrome (927545729).

The spelling of 623421403 in words is "six hundred twenty-three million, four hundred twenty-one thousand, four hundred three".