23191240 has 64 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 8885760.

The previous prime is 23191237. The next prime is 23191249. The reversal of 23191240 is 4219132.

It is a super-2 number, since 2×23191240² = 1075667225475200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23191249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129471 + ... + 129649.

It is an arithmetic number, because the mean of its divisors is an integer number (850500).

Almost surely, 2^23191240 is an apocalyptic number.

23191240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23191240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

23191240 is an abundant number, since it is smaller than the sum of its proper divisors (31240760).

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

23191240 is a wasteful number, since it uses less digits than its factorization.

23191240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 23191240 is about 4815.7283976570. The cubic root of 23191240 is about 285.1727279613.

The spelling of 23191240 in words is "twenty-three million, one hundred ninety-one thousand, two hundred forty".