18640450 has 12 divisors (see below), whose sum is σ = 34671330. Its totient is φ = 7456160.

The previous prime is 18640429. The next prime is 18640451. The reversal of 18640450 is 5404681.

It can be written as a sum of positive squares in 3 ways, for example, as 10738729 + 7901721 = 3277^2 + 2811^2 .

It is not an unprimeable number, because it can be changed into a prime (18640451) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 186355 + ... + 186454.

Almost surely, 2^18640450 is an apocalyptic number.

18640450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18640450 is a deficient number, since it is larger than the sum of its proper divisors (16030880).

18640450 is a wasteful number, since it uses less digits than its factorization.

18640450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372821 (or 372816 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 18640450 is about 4317.4587432887. The cubic root of 18640450 is about 265.1462347033.

The spelling of 18640450 in words is "eighteen million, six hundred forty thousand, four hundred fifty".