18923477 has 2 divisors, whose sum is σ = 18923478. Its totient is φ = 18923476.

The previous prime is 18923459. The next prime is 18923497. The reversal of 18923477 is 77432981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15570916 + 3352561 = 3946^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 18923477 - 2¹⁸ = 18661333 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18923407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461738 + 9461739.

It is an arithmetic number, because the mean of its divisors is an integer number (9461739).

Almost surely, 2^18923477 is an apocalyptic number.

It is an amenable number.

18923477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923477 is an equidigital number, since it uses as much as digits as its factorization.

18923477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 18923477 is about 4350.1122974011. The cubic root of 18923477 is about 266.4814475972.

The spelling of 18923477 in words is "eighteen million, nine hundred twenty-three thousand, four hundred seventy-seven".