18872040 has 192 divisors, whose sum is σ = 67728960. Its totient is φ = 4157440.

The previous prime is 18872027. The next prime is 18872041. The reversal of 18872040 is 4027881.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18871989 and 18872007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 650746 + ... + 650774.

It is an arithmetic number, because the mean of its divisors is an integer number (352755).

Almost surely, 2^18872040 is an apocalyptic number.

18872040 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 18872040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33864480).

18872040 is an abundant number, since it is smaller than the sum of its proper divisors (48856920).

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

18872040 is a wasteful number, since it uses less digits than its factorization.

18872040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18872040 is about 4344.1961281692. The cubic root of 18872040 is about 266.2397822789.

The spelling of 18872040 in words is "eighteen million, eight hundred seventy-two thousand, forty".