18946877 has 2 divisors, whose sum is σ = 18946878. Its totient is φ = 18946876.

The previous prime is 18946867. The next prime is 18946883. The reversal of 18946877 is 77864981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 2390116 = 4069^2 + 1546^2 .

It is a cyclic number.

It is not a de Polignac number, because 18946877 - 2⁶ = 18946813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18946817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9473438 + 9473439.

It is an arithmetic number, because the mean of its divisors is an integer number (9473439).

Almost surely, 2^18946877 is an apocalyptic number.

It is an amenable number.

18946877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18946877 is an equidigital number, since it uses as much as digits as its factorization.

18946877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 18946877 is about 4352.8010521962. The cubic root of 18946877 is about 266.5912423842.

The spelling of 18946877 in words is "eighteen million, nine hundred forty-six thousand, eight hundred seventy-seven".