23091440 has 40 divisors (see below), whose sum is σ = 56849040. Its totient is φ = 8692736.

The previous prime is 23091413. The next prime is 23091451. The reversal of 23091440 is 4419032.

It is a tau number, because it is divible by the number of its divisors (40).

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, 7130 + ... + 9849.

It is an arithmetic number, because the mean of its divisors is an integer number (1421226).

Almost surely, 2^23091440 is an apocalyptic number.

23091440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23091440 is an abundant number, since it is smaller than the sum of its proper divisors (33757600).

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

23091440 is a wasteful number, since it uses less digits than its factorization.

23091440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17009 (or 17003 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 23091440 is about 4805.3553458615. The cubic root of 23091440 is about 284.7630738431.

The spelling of 23091440 in words is "twenty-three million, ninety-one thousand, four hundred forty".