18878440 has 64 divisors (see below), whose sum is σ = 48936960. Its totient is φ = 6420480.

The previous prime is 18878437. The next prime is 18878467. The reversal of 18878440 is 4487881.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 18878393 and 18878402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53304 + ... + 53656.

It is an arithmetic number, because the mean of its divisors is an integer number (764640).

Almost surely, 2^18878440 is an apocalyptic number.

18878440 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 18878440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24468480).

18878440 is an abundant number, since it is smaller than the sum of its proper divisors (30058520).

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

18878440 is a wasteful number, since it uses less digits than its factorization.

18878440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 18878440 is about 4344.9326807213. The cubic root of 18878440 is about 266.2698751575.

Subtracting from 18878440 its product of nonzero digits (57344), we obtain a cube (18821096 = 266³).

The spelling of 18878440 in words is "eighteen million, eight hundred seventy-eight thousand, four hundred forty".