18137340 has 144 divisors (see below), whose sum is σ = 62008128. Its totient is φ = 4257792.

The previous prime is 18137321. The next prime is 18137359. The reversal of 18137340 is 4373181.

It is an interprime number because it is at equal distance from previous prime (18137321) and next prime (18137359).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53652 + ... + 53988.

It is an arithmetic number, because the mean of its divisors is an integer number (430612).

Almost surely, 2^18137340 is an apocalyptic number.

18137340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18137340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31004064).

18137340 is an abundant number, since it is smaller than the sum of its proper divisors (43870788).

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

18137340 is a wasteful number, since it uses less digits than its factorization.

18137340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18137340 is about 4258.7956043933. The cubic root of 18137340 is about 262.7389932268.

The spelling of 18137340 in words is "eighteen million, one hundred thirty-seven thousand, three hundred forty".