23047781 has 8 divisors (see below), whose sum is σ = 24249624. Its totient is φ = 21876480.

The previous prime is 23047769. The next prime is 23047789. The reversal of 23047781 is 18774032.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8797156 + 14250625 = 2966^2 + 3775^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23047781 - 2¹⁴ = 23031397 is a prime.

It is a super-2 number, since 2×23047781² = 1062400418047922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23047789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6080 + ... + 9113.

It is an arithmetic number, because the mean of its divisors is an integer number (3031203).

Almost surely, 2^23047781 is an apocalyptic number.

It is an amenable number.

23047781 is a deficient number, since it is larger than the sum of its proper divisors (1201843).

23047781 is a wasteful number, since it uses less digits than its factorization.

23047781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15271.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 23047781 is about 4800.8104524132. The cubic root of 23047781 is about 284.5834933775.

The spelling of 23047781 in words is "twenty-three million, forty-seven thousand, seven hundred eighty-one".