23279940 has 96 divisors (see below), whose sum is σ = 76272000. Its totient is φ = 5878656.

The previous prime is 23279939. The next prime is 23279941. The reversal of 23279940 is 4997232.

It is an interprime number because it is at equal distance from previous prime (23279939) and next prime (23279941).

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

It is a junction number, because it is equal to n+sod(n) for n = 23279895 and 23279904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23279941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9126 + ... + 11394.

It is an arithmetic number, because the mean of its divisors is an integer number (794500).

Almost surely, 2^23279940 is an apocalyptic number.

23279940 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 23279940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38136000).

23279940 is an abundant number, since it is smaller than the sum of its proper divisors (52992060).

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

23279940 is a wasteful number, since it uses less digits than its factorization.

23279940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2298 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 23279940 is about 4824.9290150219. The cubic root of 23279940 is about 285.5358340419.

The spelling of 23279940 in words is "twenty-three million, two hundred seventy-nine thousand, nine hundred forty".