23233781 has 4 divisors (see below), whose sum is σ = 24600492. Its totient is φ = 21867072.

The previous prime is 23233753. The next prime is 23233829. The reversal of 23233781 is 18733232.

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 10666756 + 12567025 = 3266^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 23233781 - 2¹⁰ = 23232757 is a prime.

It is a super-2 number, since 2×23233781² = 1079617159111922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23233081) 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, 683330 + ... + 683363.

It is an arithmetic number, because the mean of its divisors is an integer number (6150123).

Almost surely, 2^23233781 is an apocalyptic number.

It is an amenable number.

23233781 is a deficient number, since it is larger than the sum of its proper divisors (1366711).

23233781 is a wasteful number, since it uses less digits than its factorization.

23233781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366710.

The product of its digits is 6048, while the sum is 29.

The square root of 23233781 is about 4820.1432551326. The cubic root of 23233781 is about 285.3469909261.

The spelling of 23233781 in words is "twenty-three million, two hundred thirty-three thousand, seven hundred eighty-one".