18494340 has 48 divisors (see below), whose sum is σ = 52039680. Its totient is φ = 4907520.

The previous prime is 18494303. The next prime is 18494347. The reversal of 18494340 is 4349481.

It is a happy number.

It is a super-2 number, since 2×18494340² = 684081224071200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18494347) 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, 13821 + ... + 15099.

It is an arithmetic number, because the mean of its divisors is an integer number (1084160).

Almost surely, 2^18494340 is an apocalyptic number.

18494340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18494340 is an abundant number, since it is smaller than the sum of its proper divisors (33545340).

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

18494340 is a wasteful number, since it uses less digits than its factorization.

18494340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 18494340 is about 4300.5046215531. The cubic root of 18494340 is about 264.4516488293.

The spelling of 18494340 in words is "eighteen million, four hundred ninety-four thousand, three hundred forty".