23897815 has 4 divisors (see below), whose sum is σ = 28677384. Its totient is φ = 19118248.

The previous prime is 23897813. The next prime is 23897821. The reversal of 23897815 is 51879832.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23897815 - 2¹ = 23897813 is a prime.

It is a super-2 number, since 2×23897815² = 1142211123548450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23897813) 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, 2389777 + ... + 2389786.

It is an arithmetic number, because the mean of its divisors is an integer number (7169346).

Almost surely, 2^23897815 is an apocalyptic number.

23897815 is a deficient number, since it is larger than the sum of its proper divisors (4779569).

23897815 is an equidigital number, since it uses as much as digits as its factorization.

23897815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779568.

The product of its digits is 120960, while the sum is 43.

The square root of 23897815 is about 4888.5391478437. The cubic root of 23897815 is about 288.0399531442.

The spelling of 23897815 in words is "twenty-three million, eight hundred ninety-seven thousand, eight hundred fifteen".