18401473 has 2 divisors, whose sum is σ = 18401474. Its totient is φ = 18401472.

The previous prime is 18401459. The next prime is 18401479. The reversal of 18401473 is 37410481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18378369 + 23104 = 4287^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 18401473 - 2⁹ = 18400961 is a prime.

It is a super-2 number, since 2×18401473² = 677228417139458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18401479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9200736 + 9200737.

It is an arithmetic number, because the mean of its divisors is an integer number (9200737).

Almost surely, 2^18401473 is an apocalyptic number.

It is an amenable number.

18401473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18401473 is an equidigital number, since it uses as much as digits as its factorization.

18401473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18401473 is about 4289.6938119171. The cubic root of 18401473 is about 264.0082689865.

The spelling of 18401473 in words is "eighteen million, four hundred one thousand, four hundred seventy-three".