23556403 has 6 divisors (see below), whose sum is σ = 25508004. Its totient is φ = 21744216.

The previous prime is 23556391. The next prime is 23556419. The reversal of 23556403 is 30465532.

It is not a de Polignac number, because 23556403 - 2⁹ = 23555891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23556473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69525 + ... + 69862.

It is an arithmetic number, because the mean of its divisors is an integer number (4251334).

Almost surely, 2^23556403 is an apocalyptic number.

23556403 is a deficient number, since it is larger than the sum of its proper divisors (1951601).

23556403 is a wasteful number, since it uses less digits than its factorization.

23556403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139413 (or 139400 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 23556403 is about 4853.4938961536. The cubic root of 23556403 is about 286.6616910680.

It can be divided in two parts, 2355640 and 3, that multiplied together give a triangular number (7066920 = T₃₇₅₉).

The spelling of 23556403 in words is "twenty-three million, five hundred fifty-six thousand, four hundred three".