18379840 has 56 divisors (see below), whose sum is σ = 46085760. Its totient is φ = 6962688.

The previous prime is 18379819. The next prime is 18379843. The reversal of 18379840 is 4897381.

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 = 18379793 and 18379802.

It is not an unprimeable number, because it can be changed into a prime (18379843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4569 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (822960).

Almost surely, 2^18379840 is an apocalyptic number.

18379840 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 18379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23042880).

18379840 is an abundant number, since it is smaller than the sum of its proper divisors (27705920).

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

18379840 is a wasteful number, since it uses less digits than its factorization.

18379840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059 (or 3049 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18379840 is about 4287.1715617642. The cubic root of 18379840 is about 263.9047712858.

The spelling of 18379840 in words is "eighteen million, three hundred seventy-nine thousand, eight hundred forty".