23991480 has 48 divisors (see below), whose sum is σ = 77973480. Its totient is φ = 6397632.

The previous prime is 23991469. The next prime is 23991491. The reversal of 23991480 is 8419932.

It is an interprime number because it is at equal distance from previous prime (23991469) and next prime (23991491).

It is a super-2 number, since 2×23991480² = 1151182225180800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32962 + ... + 33681.

Almost surely, 2^23991480 is an apocalyptic number.

23991480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23991480 is an abundant number, since it is smaller than the sum of its proper divisors (53982000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23991480 is a wasteful number, since it uses less digits than its factorization.

23991480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66660 (or 66653 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 23991480 is about 4898.1098395197. The cubic root of 23991480 is about 288.4157767818.

It can be divided in two parts, 239 and 91480, that added together give a palindrome (91719).

The spelling of 23991480 in words is "twenty-three million, nine hundred ninety-one thousand, four hundred eighty".