23898981 has 8 divisors (see below), whose sum is σ = 31887904. Its totient is φ = 15921360.

The previous prime is 23898943. The next prime is 23899009. The reversal of 23898981 is 18989832.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-23898981 is a prime.

It is a super-2 number, since 2×23898981² = 1142322585676722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23898981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23898881) 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, 6735 + ... + 9651.

It is an arithmetic number, because the mean of its divisors is an integer number (3985988).

Almost surely, 2^23898981 is an apocalyptic number.

It is an amenable number.

23898981 is a deficient number, since it is larger than the sum of its proper divisors (7988923).

23898981 is a wasteful number, since it uses less digits than its factorization.

23898981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651.

The product of its digits is 248832, while the sum is 48.

The square root of 23898981 is about 4888.6584049205. The cubic root of 23898981 is about 288.0446376606.

It can be divided in two parts, 2 and 3898981, that added together give a palindrome (3898983).

The spelling of 23898981 in words is "twenty-three million, eight hundred ninety-eight thousand, nine hundred eighty-one".