18413977 has 2 divisors, whose sum is σ = 18413978. Its totient is φ = 18413976.

The previous prime is 18413963. The next prime is 18413981. The reversal of 18413977 is 77931481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 1296 = 4291^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 18413977 - 2⁷ = 18413849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18413987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9206988 + 9206989.

It is an arithmetic number, because the mean of its divisors is an integer number (9206989).

Almost surely, 2^18413977 is an apocalyptic number.

It is an amenable number.

18413977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18413977 is an equidigital number, since it uses as much as digits as its factorization.

18413977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 18413977 is about 4291.1510110925. The cubic root of 18413977 is about 264.0680542720.

It can be divided in two parts, 184 and 13977, that added together give a square (14161 = 119²).

The spelling of 18413977 in words is "eighteen million, four hundred thirteen thousand, nine hundred seventy-seven".