18402473 has 2 divisors, whose sum is σ = 18402474. Its totient is φ = 18402472.

The previous prime is 18402463. The next prime is 18402479. The reversal of 18402473 is 37420481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 399424 = 4243^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 18402473 - 2⁴ = 18402457 is a prime.

It is not a weakly prime, because it can be changed into another prime (18402479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9201236 + 9201237.

It is an arithmetic number, because the mean of its divisors is an integer number (9201237).

Almost surely, 2^18402473 is an apocalyptic number.

It is an amenable number.

18402473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18402473 is an equidigital number, since it uses as much as digits as its factorization.

18402473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 18402473 is about 4289.8103687692. The cubic root of 18402473 is about 264.0130512755.

The spelling of 18402473 in words is "eighteen million, four hundred two thousand, four hundred seventy-three".