18222473 has 2 divisors, whose sum is σ = 18222474. Its totient is φ = 18222472.

The previous prime is 18222461. The next prime is 18222541. The reversal of 18222473 is 37422281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13191424 + 5031049 = 3632^2 + 2243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18222473 is a prime.

It is equal to p_1164566 and since 18222473 and 1164566 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18222433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111236 + 9111237.

It is an arithmetic number, because the mean of its divisors is an integer number (9111237).

Almost surely, 2^18222473 is an apocalyptic number.

It is an amenable number.

18222473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18222473 is an equidigital number, since it uses as much as digits as its factorization.

18222473 is an evil number, because the sum of its binary digits is even.

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

The square root of 18222473 is about 4268.7788652026. The cubic root of 18222473 is about 263.1494329258.

The spelling of 18222473 in words is "eighteen million, two hundred twenty-two thousand, four hundred seventy-three".