18342740 has 24 divisors (see below), whose sum is σ = 41483400. Its totient is φ = 6772608.

The previous prime is 18342691. The next prime is 18342743. The reversal of 18342740 is 4724381.

It can be written as a sum of positive squares in 4 ways, for example, as 3489424 + 14853316 = 1868^2 + 3854^2 .

It is a super-2 number, since 2×18342740² = 672912221415200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18342743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35015 + ... + 35534.

It is an arithmetic number, because the mean of its divisors is an integer number (1728475).

Almost surely, 2^18342740 is an apocalyptic number.

18342740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18342740 is an abundant number, since it is smaller than the sum of its proper divisors (23140660).

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

18342740 is a wasteful number, since it uses less digits than its factorization.

18342740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70571 (or 70569 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 18342740 is about 4282.8425140320. The cubic root of 18342740 is about 263.7270863497.

The spelling of 18342740 in words is "eighteen million, three hundred forty-two thousand, seven hundred forty".