18869040 has 120 divisors (see below), whose sum is σ = 64415520. Its totient is φ = 4948992.

The previous prime is 18869029. The next prime is 18869041. The reversal of 18869040 is 4096881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

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 = 18868986 and 18869004.

It is not an unprimeable number, because it can be changed into a prime (18869041) 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, 52381 + ... + 52739.

It is an arithmetic number, because the mean of its divisors is an integer number (536796).

Almost surely, 2^18869040 is an apocalyptic number.

18869040 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 18869040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32207760).

18869040 is an abundant number, since it is smaller than the sum of its proper divisors (45546480).

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

18869040 is a wasteful number, since it uses less digits than its factorization.

18869040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18869040 is about 4343.8508261680. The cubic root of 18869040 is about 266.2256739000.

The spelling of 18869040 in words is "eighteen million, eight hundred sixty-nine thousand, forty".