18871860 has 120 divisors (see below), whose sum is σ = 62114976. Its totient is φ = 4280640.

The previous prime is 18871859. The next prime is 18871861. The reversal of 18871860 is 6817881.

It is an interprime number because it is at equal distance from previous prime (18871859) and next prime (18871861).

It is a super-2 number, since 2×18871860² = 712294199719200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871861) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 143995 + ... + 144125.

Almost surely, 2^18871860 is an apocalyptic number.

18871860 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 18871860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31057488).

18871860 is an abundant number, since it is smaller than the sum of its proper divisors (43243116).

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

18871860 is a wasteful number, since it uses less digits than its factorization.

18871860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 18871860 is about 4344.1754108231. The cubic root of 18871860 is about 266.2389358183.

The spelling of 18871860 in words is "eighteen million, eight hundred seventy-one thousand, eight hundred sixty".