18451340 has 24 divisors (see below), whose sum is σ = 39151392. Its totient is φ = 7303680.

The previous prime is 18451339. The next prime is 18451351. The reversal of 18451340 is 4315481.

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 7 ways as a sum of consecutive naturals, for example, 2816 + ... + 6695.

It is an arithmetic number, because the mean of its divisors is an integer number (1631308).

Almost surely, 2^18451340 is an apocalyptic number.

18451340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18451340 is an abundant number, since it is smaller than the sum of its proper divisors (20700052).

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

18451340 is a wasteful number, since it uses less digits than its factorization.

18451340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9617 (or 9615 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 18451340 is about 4295.5022989169. The cubic root of 18451340 is about 264.2465366115.

The spelling of 18451340 in words is "eighteen million, four hundred fifty-one thousand, three hundred forty".