18801869 has 2 divisors, whose sum is σ = 18801870. Its totient is φ = 18801868.

The previous prime is 18801859. The next prime is 18801899. The reversal of 18801869 is 96810881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 2439844 = 4045^2 + 1562^2 .

It is a cyclic number.

It is not a de Polignac number, because 18801869 - 2⁸ = 18801613 is a prime.

It is a super-2 number, since 2×18801869² = 707020555786322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18801859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9400934 + 9400935.

It is an arithmetic number, because the mean of its divisors is an integer number (9400935).

Almost surely, 2^18801869 is an apocalyptic number.

It is an amenable number.

18801869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18801869 is an equidigital number, since it uses as much as digits as its factorization.

18801869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18801869 is about 4336.1121987329. The cubic root of 18801869 is about 265.9093902475.

The spelling of 18801869 in words is "eighteen million, eight hundred one thousand, eight hundred sixty-nine".