23405553 has 12 divisors (see below), whose sum is σ = 33854080. Its totient is φ = 15582456.

The previous prime is 23405539. The next prime is 23405561. The reversal of 23405553 is 35550432.

It is not a de Polignac number, because 23405553 - 2⁴ = 23405537 is a prime.

It is a super-2 number, since 2×23405553² = 1095639822471618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23405533) 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 11 ways as a sum of consecutive naturals, for example, 8100 + ... + 10602.

Almost surely, 2^23405553 is an apocalyptic number.

It is an amenable number.

23405553 is a deficient number, since it is larger than the sum of its proper divisors (10448527).

23405553 is a wasteful number, since it uses less digits than its factorization.

23405553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548 (or 3545 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 23405553 is about 4837.9285856656. The cubic root of 23405553 is about 286.0484741870.

Adding to 23405553 its reverse (35550432), we get a palindrome (58955985).

The spelling of 23405553 in words is "twenty-three million, four hundred five thousand, five hundred fifty-three".