18975321 has 6 divisors (see below), whose sum is σ = 27408810. Its totient is φ = 12650208.

The previous prime is 18975311. The next prime is 18975337. The reversal of 18975321 is 12357981.

It can be written as a sum of positive squares in only one way, i.e., 15515721 + 3459600 = 3939^2 + 1860^2 .

It is not a de Polignac number, because 18975321 - 2⁵ = 18975289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18975301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1054176 + ... + 1054193.

It is an arithmetic number, because the mean of its divisors is an integer number (4568135).

Almost surely, 2^18975321 is an apocalyptic number.

It is an amenable number.

18975321 is a deficient number, since it is larger than the sum of its proper divisors (8433489).

18975321 is a wasteful number, since it uses less digits than its factorization.

18975321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108375 (or 2108372 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 18975321 is about 4356.0671482428. The cubic root of 18975321 is about 266.7245823860.

The spelling of 18975321 in words is "eighteen million, nine hundred seventy-five thousand, three hundred twenty-one".