18627997 has 4 divisors (see below), whose sum is σ = 18933436. Its totient is φ = 18322560.

The previous prime is 18627989. The next prime is 18628003. The reversal of 18627997 is 79972681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1038361 + 17589636 = 1019^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 18627997 - 2³ = 18627989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18627997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18627197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152628 + ... + 152749.

It is an arithmetic number, because the mean of its divisors is an integer number (4733359).

Almost surely, 2^18627997 is an apocalyptic number.

It is an amenable number.

18627997 is a deficient number, since it is larger than the sum of its proper divisors (305439).

18627997 is an equidigital number, since it uses as much as digits as its factorization.

18627997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305438.

The product of its digits is 381024, while the sum is 49.

The square root of 18627997 is about 4316.0163345381. The cubic root of 18627997 is about 265.0871767296.

The spelling of 18627997 in words is "eighteen million, six hundred twenty-seven thousand, nine hundred ninety-seven".