18818371 has 16 divisors (see below), whose sum is σ = 23411808. Its totient is φ = 14860800.

The previous prime is 18818369. The next prime is 18818381. The reversal of 18818371 is 17381881.

It is a cyclic number.

It is not a de Polignac number, because 18818371 - 2¹ = 18818369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18818371.

It is not an unprimeable number, because it can be changed into a prime (18818351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440 + ... + 6301.

It is an arithmetic number, because the mean of its divisors is an integer number (1463238).

Almost surely, 2^18818371 is an apocalyptic number.

18818371 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18818371 is a deficient number, since it is larger than the sum of its proper divisors (4593437).

18818371 is a wasteful number, since it uses less digits than its factorization.

18818371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782.

The product of its digits is 10752, while the sum is 37.

The square root of 18818371 is about 4338.0146380574. The cubic root of 18818371 is about 265.9871618354.

The spelling of 18818371 in words is "eighteen million, eight hundred eighteen thousand, three hundred seventy-one".