23713781 has 16 divisors (see below), whose sum is σ = 29979264. Its totient is φ = 18252864.

The previous prime is 23713763. The next prime is 23713799. The reversal of 23713781 is 18731732.

It is an interprime number because it is at equal distance from previous prime (23713763) and next prime (23713799).

It is a de Polignac number, because none of the positive numbers 2^k-23713781 is a prime.

It is a super-2 number, since 2×23713781² = 1124686818631922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23713721) 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 15 ways as a sum of consecutive naturals, for example, 155 + ... + 6888.

It is an arithmetic number, because the mean of its divisors is an integer number (1873704).

Almost surely, 2^23713781 is an apocalyptic number.

It is an amenable number.

23713781 is a deficient number, since it is larger than the sum of its proper divisors (6265483).

23713781 is a wasteful number, since it uses less digits than its factorization.

23713781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100.

The product of its digits is 7056, while the sum is 32.

The square root of 23713781 is about 4869.6797635984. The cubic root of 23713781 is about 287.2986607973.

The spelling of 23713781 in words is "twenty-three million, seven hundred thirteen thousand, seven hundred eighty-one".