23391840 has 48 divisors (see below), whose sum is σ = 73685808. Its totient is φ = 6237696.

The previous prime is 23391839. The next prime is 23391859. The reversal of 23391840 is 4819332.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-6 number, since 6×23391840⁶ (a number of 45 digits) contains 666666 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 23391798 and 23391807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23887 + ... + 24846.

It is an arithmetic number, because the mean of its divisors is an integer number (1535121).

Almost surely, 2^23391840 is an apocalyptic number.

23391840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23391840 is an abundant number, since it is smaller than the sum of its proper divisors (50293968).

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

23391840 is a wasteful number, since it uses less digits than its factorization.

23391840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48751 (or 48743 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 23391840 is about 4836.5111392408. The cubic root of 23391840 is about 285.9925992836.

The spelling of 23391840 in words is "twenty-three million, three hundred ninety-one thousand, eight hundred forty".