18872801 has 2 divisors, whose sum is σ = 18872802. Its totient is φ = 18872800.

The previous prime is 18872779. The next prime is 18872809. The reversal of 18872801 is 10827881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15171025 + 3701776 = 3895^2 + 1924^2 .

It is an emirp because it is prime and its reverse (10827881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18872801 is a prime.

It is not a weakly prime, because it can be changed into another prime (18872809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436400 + 9436401.

It is an arithmetic number, because the mean of its divisors is an integer number (9436401).

Almost surely, 2^18872801 is an apocalyptic number.

It is an amenable number.

18872801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872801 is an equidigital number, since it uses as much as digits as its factorization.

18872801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 18872801 is about 4344.2837154127. The cubic root of 18872801 is about 266.2433608666.

The spelling of 18872801 in words is "eighteen million, eight hundred seventy-two thousand, eight hundred one".