23404561 has 8 divisors (see below), whose sum is σ = 24730880. Its totient is φ = 22087728.

The previous prime is 23404517. The next prime is 23404571. The reversal of 23404561 is 16540432.

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

It is not a de Polignac number, because 23404561 - 2⁹ = 23404049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23404571) 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, 3040 + ... + 7486.

It is an arithmetic number, because the mean of its divisors is an integer number (3091360).

Almost surely, 2^23404561 is an apocalyptic number.

It is an amenable number.

23404561 is a deficient number, since it is larger than the sum of its proper divisors (1326319).

23404561 is a wasteful number, since it uses less digits than its factorization.

23404561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4743.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 23404561 is about 4837.8260613627. The cubic root of 23404561 is about 286.0444329225.

Adding to 23404561 its reverse (16540432), we get a palindrome (39944993).

The spelling of 23404561 in words is "twenty-three million, four hundred four thousand, five hundred sixty-one".