18860819 has 2 divisors, whose sum is σ = 18860820. Its totient is φ = 18860818.

The previous prime is 18860801. The next prime is 18860827. The reversal of 18860819 is 91806881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18860819 - 2⁸ = 18860563 is a prime.

It is a super-2 number, since 2×18860819² = 711460986701522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18860839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430409 + 9430410.

It is an arithmetic number, because the mean of its divisors is an integer number (9430410).

Almost surely, 2^18860819 is an apocalyptic number.

18860819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18860819 is an equidigital number, since it uses as much as digits as its factorization.

18860819 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 18860819 is about 4342.9044428815. The cubic root of 18860819 is about 266.1870045736.

The spelling of 18860819 in words is "eighteen million, eight hundred sixty thousand, eight hundred nineteen".