18887040 has 128 divisors (see below), whose sum is σ = 66952800. Its totient is φ = 5031936.

The previous prime is 18887039. The next prime is 18887047. The reversal of 18887040 is 4078881.

It is a tau number, because it is divible by the number of its divisors (128).

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 = 18886986 and 18887004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18887047) 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, 16734 + ... + 17826.

Almost surely, 2^18887040 is an apocalyptic number.

18887040 is a gapful number since it is divisible by the number (10) 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 18887040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33476400).

18887040 is an abundant number, since it is smaller than the sum of its proper divisors (48065760).

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

18887040 is a wasteful number, since it uses less digits than its factorization.

18887040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18887040 is about 4345.9222266396. The cubic root of 18887040 is about 266.3103017551.

The spelling of 18887040 in words is "eighteen million, eight hundred eighty-seven thousand, forty".