18343477 has 2 divisors, whose sum is σ = 18343478. Its totient is φ = 18343476.

The previous prime is 18343469. The next prime is 18343483. The reversal of 18343477 is 77434381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 1418481 = 4114^2 + 1191^2 .

It is an emirp because it is prime and its reverse (77434381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18343477 - 2³ = 18343469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18343427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171738 + 9171739.

It is an arithmetic number, because the mean of its divisors is an integer number (9171739).

Almost surely, 2^18343477 is an apocalyptic number.

It is an amenable number.

18343477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343477 is an equidigital number, since it uses as much as digits as its factorization.

18343477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 37.

The square root of 18343477 is about 4282.9285541554. The cubic root of 18343477 is about 263.7306184331.

It can be divided in two parts, 183 and 43477, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 18343477 in words is "eighteen million, three hundred forty-three thousand, four hundred seventy-seven".