23387040 has 144 divisors (see below), whose sum is σ = 81081000. Its totient is φ = 6137856.

The previous prime is 23387033. The next prime is 23387041. The reversal of 23387040 is 4078332.

It can be written as a sum of positive squares in 4 ways, for example, as 16353936 + 7033104 = 4044^2 + 2652^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 23386995 and 23387013.

It is not an unprimeable number, because it can be changed into a prime (23387041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156886 + ... + 157034.

Almost surely, 2^23387040 is an apocalyptic number.

23387040 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 23387040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40540500).

23387040 is an abundant number, since it is smaller than the sum of its proper divisors (57693960).

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

23387040 is a wasteful number, since it uses less digits than its factorization.

23387040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 23387040 is about 4836.0148883146. The cubic root of 23387040 is about 285.9730360743.

The spelling of 23387040 in words is "twenty-three million, three hundred eighty-seven thousand, forty".