23781900 has 36 divisors (see below), whose sum is σ = 68809832. Its totient is φ = 6341760.

The previous prime is 23781853. The next prime is 23781913. The reversal of 23781900 is 918732.

It is a happy number.

It is a super-2 number, since 2×23781900² = 1131157535220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39337 + ... + 39936.

Almost surely, 2^23781900 is an apocalyptic number.

23781900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23781900 is an abundant number, since it is smaller than the sum of its proper divisors (45027932).

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

23781900 is a wasteful number, since it uses less digits than its factorization.

23781900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79290 (or 79283 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 23781900 is about 4876.6689450895. The cubic root of 23781900 is about 287.5734909794.

It can be divided in two parts, 2378 and 1900, that added together give a triangular number (4278 = T₉₂).

The spelling of 23781900 in words is "twenty-three million, seven hundred eighty-one thousand, nine hundred".