18415073 has 2 divisors, whose sum is σ = 18415074. Its totient is φ = 18415072.

The previous prime is 18415069. The next prime is 18415081. The reversal of 18415073 is 37051481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15816529 + 2598544 = 3977^2 + 1612^2 .

It is an emirp because it is prime and its reverse (37051481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18415073 - 2² = 18415069 is a prime.

It is a super-2 number, since 2×18415073² = 678229827190658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18415003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9207536 + 9207537.

It is an arithmetic number, because the mean of its divisors is an integer number (9207537).

Almost surely, 2^18415073 is an apocalyptic number.

It is an amenable number.

18415073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18415073 is an equidigital number, since it uses as much as digits as its factorization.

18415073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 18415073 is about 4291.2787138567. The cubic root of 18415073 is about 264.0732932787.

The spelling of 18415073 in words is "eighteen million, four hundred fifteen thousand, seventy-three".