23981895 has 48 divisors (see below), whose sum is σ = 50019840. Its totient is φ = 10383552.

The previous prime is 23981863. The next prime is 23981897. The reversal of 23981895 is 59818932.

It is a happy number.

It is not a de Polignac number, because 23981895 - 2⁵ = 23981863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 23981895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23981897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3982 + ... + 7988.

It is an arithmetic number, because the mean of its divisors is an integer number (1042080).

Almost surely, 2^23981895 is an apocalyptic number.

23981895 is an abundant number, since it is smaller than the sum of its proper divisors (26037945).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23981895 is a wasteful number, since it uses less digits than its factorization.

23981895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044 (or 4041 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 23981895 is about 4897.1313031202. The cubic root of 23981895 is about 288.3773626801.

The spelling of 23981895 in words is "twenty-three million, nine hundred eighty-one thousand, eight hundred ninety-five".