18942417 has 20 divisors (see below), whose sum is σ = 30475060. Its totient is φ = 11656224.

The previous prime is 18942401. The next prime is 18942419. The reversal of 18942417 is 71424981.

It can be written as a sum of positive squares in 2 ways, for example, as 8503056 + 10439361 = 2916^2 + 3231^2 .

It is not a de Polignac number, because 18942417 - 2⁴ = 18942401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18942419) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7942 + ... + 10047.

It is an arithmetic number, because the mean of its divisors is an integer number (1523753).

Almost surely, 2^18942417 is an apocalyptic number.

It is an amenable number.

18942417 is a deficient number, since it is larger than the sum of its proper divisors (11532643).

18942417 is a wasteful number, since it uses less digits than its factorization.

18942417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18014 (or 18005 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18942417 is about 4352.2887082545. The cubic root of 18942417 is about 266.5703226613.

The spelling of 18942417 in words is "eighteen million, nine hundred forty-two thousand, four hundred seventeen".