18340861 has 16 divisors (see below), whose sum is σ = 22969728. Its totient is φ = 14227200.

The previous prime is 18340859. The next prime is 18340873. The reversal of 18340861 is 16804381.

It is a cyclic number.

It is not a de Polignac number, because 18340861 - 2¹ = 18340859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340891) 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, 23721 + ... + 24481.

It is an arithmetic number, because the mean of its divisors is an integer number (1435608).

Almost surely, 2^18340861 is an apocalyptic number.

18340861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18340861 is a deficient number, since it is larger than the sum of its proper divisors (4628867).

18340861 is a wasteful number, since it uses less digits than its factorization.

18340861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18340861 is about 4282.6231447560. The cubic root of 18340861 is about 263.7180807865.

The spelling of 18340861 in words is "eighteen million, three hundred forty thousand, eight hundred sixty-one".