23099440 has 160 divisors (see below), whose sum is σ = 69995520. Its totient is φ = 6884352.

The previous prime is 23099431. The next prime is 23099449. The reversal of 23099440 is 4499032.

It is an interprime number because it is at equal distance from previous prime (23099431) and next prime (23099449).

It is not an unprimeable number, because it can be changed into a prime (23099449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138237 + ... + 138403.

It is an arithmetic number, because the mean of its divisors is an integer number (437472).

Almost surely, 2^23099440 is an apocalyptic number.

23099440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

23099440 is the 3040-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23099440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34997760).

23099440 is an abundant number, since it is smaller than the sum of its proper divisors (46896080).

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

23099440 is a wasteful number, since it uses less digits than its factorization.

23099440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 23099440 is about 4806.1876783996. The cubic root of 23099440 is about 284.7959553144.

The spelling of 23099440 in words is "twenty-three million, ninety-nine thousand, four hundred forty".