18190477 has 2 divisors, whose sum is σ = 18190478. Its totient is φ = 18190476.

The previous prime is 18190451. The next prime is 18190481. The reversal of 18190477 is 77409181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13942756 + 4247721 = 3734^2 + 2061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18190477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18190577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9095238 + 9095239.

It is an arithmetic number, because the mean of its divisors is an integer number (9095239).

Almost surely, 2^18190477 is an apocalyptic number.

It is an amenable number.

18190477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18190477 is an equidigital number, since it uses as much as digits as its factorization.

18190477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 18190477 is about 4265.0295426878. The cubic root of 18190477 is about 262.9953253758.

The spelling of 18190477 in words is "eighteen million, one hundred ninety thousand, four hundred seventy-seven".