23109940 has 48 divisors (see below), whose sum is σ = 57883392. Its totient is φ = 7577856.

The previous prime is 23109913. The next prime is 23109943. The reversal of 23109940 is 4990132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 23109899 and 23109908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23109943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (1205904).

Almost surely, 2^23109940 is an apocalyptic number.

23109940 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 23109940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28941696).

23109940 is an abundant number, since it is smaller than the sum of its proper divisors (34773452).

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

23109940 is a wasteful number, since it uses less digits than its factorization.

23109940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216 (or 7214 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 23109940 is about 4807.2798961575. The cubic root of 23109940 is about 284.8391007261.

The spelling of 23109940 in words is "twenty-three million, one hundred nine thousand, nine hundred forty".