23698021 has 4 divisors (see below), whose sum is σ = 23907852. Its totient is φ = 23488192.

The previous prime is 23698013. The next prime is 23698033. The reversal of 23698021 is 12089632.

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 3348900 + 20349121 = 1830^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 23698021 - 2³ = 23698013 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23698001) 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 3 ways as a sum of consecutive naturals, for example, 104746 + ... + 104971.

It is an arithmetic number, because the mean of its divisors is an integer number (5976963).

Almost surely, 2^23698021 is an apocalyptic number.

It is an amenable number.

23698021 is a deficient number, since it is larger than the sum of its proper divisors (209831).

23698021 is a wasteful number, since it uses less digits than its factorization.

23698021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209830.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 23698021 is about 4868.0613184306. The cubic root of 23698021 is about 287.2350011850.

The spelling of 23698021 in words is "twenty-three million, six hundred ninety-eight thousand, twenty-one".