18446413 has 2 divisors, whose sum is σ = 18446414. Its totient is φ = 18446412.

The previous prime is 18446399. The next prime is 18446431. The reversal of 18446413 is 31464481.

Together with next prime (18446431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 110889 = 4282^2 + 333^2 .

It is an emirp because it is prime and its reverse (31464481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18446413 - 2¹³ = 18438221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18446453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9223206 + 9223207.

It is an arithmetic number, because the mean of its divisors is an integer number (9223207).

Almost surely, 2^18446413 is an apocalyptic number.

It is an amenable number.

18446413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18446413 is an equidigital number, since it uses as much as digits as its factorization.

18446413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 18446413 is about 4294.9287537746. The cubic root of 18446413 is about 264.2230142261.

The spelling of 18446413 in words is "eighteen million, four hundred forty-six thousand, four hundred thirteen".