18997450 has 24 divisors (see below), whose sum is σ = 35708652. Its totient is φ = 7518720.

The previous prime is 18997441. The next prime is 18997453. The reversal of 18997450 is 5479981.

It can be written as a sum of positive squares in 6 ways, for example, as 9492561 + 9504889 = 3081^2 + 3083^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18997397 and 18997406.

It is not an unprimeable number, because it can be changed into a prime (18997453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2892 + ... + 6808.

Almost surely, 2^18997450 is an apocalyptic number.

18997450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18997450 is a deficient number, since it is larger than the sum of its proper divisors (16711202).

18997450 is a wasteful number, since it uses less digits than its factorization.

18997450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026 (or 4021 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18997450 is about 4358.6064286650. The cubic root of 18997450 is about 266.8282267518.

The spelling of 18997450 in words is "eighteen million, nine hundred ninety-seven thousand, four hundred fifty".