18419773 has 2 divisors, whose sum is σ = 18419774. Its totient is φ = 18419772.

The previous prime is 18419767. The next prime is 18419813. The reversal of 18419773 is 37791481.

It is an a-pointer prime, because the next prime (18419813) can be obtained adding 18419773 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 5184729 = 3638^2 + 2277^2 .

It is a cyclic number.

It is not a de Polignac number, because 18419773 - 2¹⁷ = 18288701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18419273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209886 + 9209887.

It is an arithmetic number, because the mean of its divisors is an integer number (9209887).

Almost surely, 2^18419773 is an apocalyptic number.

It is an amenable number.

18419773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18419773 is an equidigital number, since it uses as much as digits as its factorization.

18419773 is an evil number, because the sum of its binary digits is even.

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

The square root of 18419773 is about 4291.8263012382. The cubic root of 18419773 is about 264.0957574652.

The spelling of 18419773 in words is "eighteen million, four hundred nineteen thousand, seven hundred seventy-three".