23618421 has 6 divisors (see below), whose sum is σ = 34115510. Its totient is φ = 15745608.

The previous prime is 23618417. The next prime is 23618429. The reversal of 23618421 is 12481632.

23618421 is a `hidden beast` number, since 2 + 3 + 618 + 42 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23415921 + 202500 = 4839^2 + 450^2 .

It is not a de Polignac number, because 23618421 - 2² = 23618417 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 (23618429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1312126 + ... + 1312143.

Almost surely, 2^23618421 is an apocalyptic number.

It is an amenable number.

23618421 is a deficient number, since it is larger than the sum of its proper divisors (10497089).

23618421 is a wasteful number, since it uses less digits than its factorization.

23618421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624275 (or 2624272 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 23618421 is about 4859.8787021900. The cubic root of 23618421 is about 286.9130396536.

The spelling of 23618421 in words is "twenty-three million, six hundred eighteen thousand, four hundred twenty-one".