23985421 has 4 divisors (see below), whose sum is σ = 24005212. Its totient is φ = 23965632.

The previous prime is 23985373. The next prime is 23985431. The reversal of 23985421 is 12458932.

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 19096900 + 4888521 = 4370^2 + 2211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23985421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23985431) 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, 7950 + ... + 10543.

It is an arithmetic number, because the mean of its divisors is an integer number (6001303).

Almost surely, 2^23985421 is an apocalyptic number.

It is an amenable number.

23985421 is a deficient number, since it is larger than the sum of its proper divisors (19791).

23985421 is a wasteful number, since it uses less digits than its factorization.

23985421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19790.

The product of its digits is 17280, while the sum is 34.

The square root of 23985421 is about 4897.4912965722. The cubic root of 23985421 is about 288.3914951295.

The spelling of 23985421 in words is "twenty-three million, nine hundred eighty-five thousand, four hundred twenty-one".