23009381 has 8 divisors (see below), whose sum is σ = 24697944. Its totient is φ = 21358080.

The previous prime is 23009377. The next prime is 23009411. The reversal of 23009381 is 18390032.

It can be written as a sum of positive squares in 4 ways, for example, as 6477025 + 16532356 = 2545^2 + 4066^2 .

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 23009381 - 2² = 23009377 is a prime.

It is a super-2 number, since 2×23009381² = 1058863228006322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23009381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23069381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8030 + ... + 10511.

It is an arithmetic number, because the mean of its divisors is an integer number (3087243).

Almost surely, 2^23009381 is an apocalyptic number.

It is an amenable number.

23009381 is a deficient number, since it is larger than the sum of its proper divisors (1688563).

23009381 is a wasteful number, since it uses less digits than its factorization.

23009381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18631.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 23009381 is about 4796.8094604643. The cubic root of 23009381 is about 284.4253569560.

The spelling of 23009381 in words is "twenty-three million, nine thousand, three hundred eighty-one".