23472781 has 4 divisors (see below), whose sum is σ = 23486652. Its totient is φ = 23458912.

The previous prime is 23472769. The next prime is 23472817. The reversal of 23472781 is 18727432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16402500 + 7070281 = 4050^2 + 2659^2 .

It is a cyclic number.

It is not a de Polignac number, because 23472781 - 2⁵ = 23472749 is a prime.

It is a super-2 number, since 2×23472781² = 1101942895747922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23472731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3976 + ... + 7921.

It is an arithmetic number, because the mean of its divisors is an integer number (5871663).

Almost surely, 2^23472781 is an apocalyptic number.

It is an amenable number.

23472781 is a deficient number, since it is larger than the sum of its proper divisors (13871).

23472781 is a wasteful number, since it uses less digits than its factorization.

23472781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13870.

The product of its digits is 18816, while the sum is 34.

The square root of 23472781 is about 4844.8716185261. The cubic root of 23472781 is about 286.3220856699.

The spelling of 23472781 in words is "twenty-three million, four hundred seventy-two thousand, seven hundred eighty-one".