23921881 has 9 divisors (see below), whose sum is σ = 24621471. Its totient is φ = 23242032.

The previous prime is 23921861. The next prime is 23921899. The reversal of 23921881 is 18812932.

The square root of 23921881 is 4891.

It is a perfect power (a square), and thus also a powerful number.

23921881 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 10342656 = 3685^2 + 3216^2 .

It is not a de Polignac number, because 23921881 - 2¹³ = 23913689 is a prime.

It is a super-2 number, since 2×23921881² = 1144512781156322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (23921831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 327661 + ... + 327733.

It is an arithmetic number, because the mean of its divisors is an integer number (2735719).

Almost surely, 2^23921881 is an apocalyptic number.

23921881 is the 4891-st square number.

23921881 is the 2446-th centered octagonal number.

It is an amenable number.

23921881 is a deficient number, since it is larger than the sum of its proper divisors (699590).

23921881 is an frugal number, since it uses more digits than its factorization.

23921881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 140 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The cubic root of 23921881 is about 288.1366097338.

The spelling of 23921881 in words is "twenty-three million, nine hundred twenty-one thousand, eight hundred eighty-one".