23236840 has 48 divisors (see below), whose sum is σ = 57479940. Its totient is φ = 8448000.

The previous prime is 23236817. The next prime is 23236861. The reversal of 23236840 is 4863232.

It can be written as a sum of positive squares in 2 ways, for example, as 23213124 + 23716 = 4818^2 + 154^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 23236799 and 23236808.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2440 + ... + 7240.

Almost surely, 2^23236840 is an apocalyptic number.

23236840 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 23236840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28739970).

23236840 is an abundant number, since it is smaller than the sum of its proper divisors (34243100).

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

23236840 is a wasteful number, since it uses less digits than its factorization.

23236840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834 (or 4819 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 23236840 is about 4820.4605589093. The cubic root of 23236840 is about 285.3595134701.

The spelling of 23236840 in words is "twenty-three million, two hundred thirty-six thousand, eight hundred forty".