18301840 has 20 divisors (see below), whose sum is σ = 42551964. Its totient is φ = 7320704.

The previous prime is 18301799. The next prime is 18301841. The reversal of 18301840 is 4810381.

It can be written as a sum of positive squares in 2 ways, for example, as 14107536 + 4194304 = 3756^2 + 2048^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (18301841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114307 + ... + 114466.

Almost surely, 2^18301840 is an apocalyptic number.

18301840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18301840 is an abundant number, since it is smaller than the sum of its proper divisors (24250124).

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

18301840 is a wasteful number, since it uses less digits than its factorization.

18301840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228786 (or 228780 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18301840 is about 4278.0649831437. The cubic root of 18301840 is about 263.5309240016.

The spelling of 18301840 in words is "eighteen million, three hundred one thousand, eight hundred forty".