18416977 has 2 divisors, whose sum is σ = 18416978. Its totient is φ = 18416976.

The previous prime is 18416971. The next prime is 18416989. The reversal of 18416977 is 77961481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9884736 + 8532241 = 3144^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 18416977 - 2³ = 18416969 is a prime.

It is not a weakly prime, because it can be changed into another prime (18416971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208488 + 9208489.

It is an arithmetic number, because the mean of its divisors is an integer number (9208489).

Almost surely, 2^18416977 is an apocalyptic number.

It is an amenable number.

18416977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18416977 is an equidigital number, since it uses as much as digits as its factorization.

18416977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The square root of 18416977 is about 4291.5005534195. The cubic root of 18416977 is about 264.0823941246.

It can be divided in two parts, 184 and 16977, that added together give a square (17161 = 131²).

The spelling of 18416977 in words is "eighteen million, four hundred sixteen thousand, nine hundred seventy-seven".