18858340 has 12 divisors (see below), whose sum is σ = 39602556. Its totient is φ = 7543328.

The previous prime is 18858337. The next prime is 18858353. The reversal of 18858340 is 4385881.

It can be written as a sum of positive squares in 2 ways, for example, as 4235364 + 14622976 = 2058^2 + 3824^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18858340.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471439 + ... + 471478.

It is an arithmetic number, because the mean of its divisors is an integer number (3300213).

Almost surely, 2^18858340 is an apocalyptic number.

18858340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18858340 is an abundant number, since it is smaller than the sum of its proper divisors (20744216).

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

18858340 is a wasteful number, since it uses less digits than its factorization.

18858340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942926 (or 942924 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 18858340 is about 4342.6190254269. The cubic root of 18858340 is about 266.1753418334.

The spelling of 18858340 in words is "eighteen million, eight hundred fifty-eight thousand, three hundred forty".