23990040 has 128 divisors (see below), whose sum is σ = 81144000. Its totient is φ = 6303744.

The previous prime is 23989997. The next prime is 23990059. The reversal of 23990040 is 4009932.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 23989986 and 23990013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104646 + ... + 104874.

Almost surely, 2^23990040 is an apocalyptic number.

23990040 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 23990040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40572000).

23990040 is an abundant number, since it is smaller than the sum of its proper divisors (57153960).

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

23990040 is a wasteful number, since it uses less digits than its factorization.

23990040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 23990040 is about 4897.9628418354. The cubic root of 23990040 is about 288.4100063023.

Adding to 23990040 its reverse (4009932), we get a palindrome (27999972).

The spelling of 23990040 in words is "twenty-three million, nine hundred ninety thousand, forty".