18415373 has 2 divisors, whose sum is σ = 18415374. Its totient is φ = 18415372.

The previous prime is 18415361. The next prime is 18415379. The reversal of 18415373 is 37351481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16144324 + 2271049 = 4018^2 + 1507^2 .

It is a cyclic number.

It is not a de Polignac number, because 18415373 - 2¹² = 18411277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18415379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9207686 + 9207687.

It is an arithmetic number, because the mean of its divisors is an integer number (9207687).

Almost surely, 2^18415373 is an apocalyptic number.

It is an amenable number.

18415373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18415373 is an equidigital number, since it uses as much as digits as its factorization.

18415373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 18415373 is about 4291.3136683305. The cubic root of 18415373 is about 264.0747272771.

The spelling of 18415373 in words is "eighteen million, four hundred fifteen thousand, three hundred seventy-three".