18454490 has 16 divisors (see below), whose sum is σ = 34116552. Its totient is φ = 7182144.

The previous prime is 18454483. The next prime is 18454507. The reversal of 18454490 is 9445481.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13315201 + 5139289 = 3649^2 + 2267^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18454490.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24569 + ... + 25308.

Almost surely, 2^18454490 is an apocalyptic number.

18454490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18454490 is a deficient number, since it is larger than the sum of its proper divisors (15662062).

18454490 is a wasteful number, since it uses less digits than its factorization.

18454490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49921.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 18454490 is about 4295.8689458595. The cubic root of 18454490 is about 264.2615730845.

Subtracting from 18454490 its reverse (9445481), we obtain a palindrome (9009009).

The spelling of 18454490 in words is "eighteen million, four hundred fifty-four thousand, four hundred ninety".