18870684 has 72 divisors (see below), whose sum is σ = 52093440. Its totient is φ = 5300064.

The previous prime is 18870647. The next prime is 18870689. The reversal of 18870684 is 48607881.

It is a super-2 number, since 2×18870684² = 712205429255712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870689) 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, 39157 + ... + 39635.

It is an arithmetic number, because the mean of its divisors is an integer number (723520).

Almost surely, 2^18870684 is an apocalyptic number.

18870684 is a gapful number since it is divisible by the number (14) 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 18870684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26046720).

18870684 is an abundant number, since it is smaller than the sum of its proper divisors (33222756).

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

18870684 is a wasteful number, since it uses less digits than its factorization.

18870684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 18870684 is about 4344.0400550639. The cubic root of 18870684 is about 266.2334054768.

The spelling of 18870684 in words is "eighteen million, eight hundred seventy thousand, six hundred eighty-four".