18818040 has 32 divisors (see below), whose sum is σ = 56454480. Its totient is φ = 5018112.

The previous prime is 18818029. The next prime is 18818069. The reversal of 18818040 is 4081881.

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 = 18817989 and 18818007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78289 + ... + 78528.

Almost surely, 2^18818040 is an apocalyptic number.

18818040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18818040 is an abundant number, since it is smaller than the sum of its proper divisors (37636440).

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

18818040 is a wasteful number, since it uses less digits than its factorization.

18818040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156831 (or 156827 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 18818040 is about 4337.9764867966. The cubic root of 18818040 is about 265.9856023262.

The spelling of 18818040 in words is "eighteen million, eight hundred eighteen thousand, forty".