17942849 has 4 divisors (see below), whose sum is σ = 17955540. Its totient is φ = 17930160.

The previous prime is 17942843. The next prime is 17942863. The reversal of 17942849 is 94824971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94824971 = 701 ⋅135271.

It can be written as a sum of positive squares in 2 ways, for example, as 7263025 + 10679824 = 2695^2 + 3268^2 .

It is a cyclic number.

It is not a de Polignac number, because 17942849 - 2⁴ = 17942833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17942843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3914 + ... + 7155.

It is an arithmetic number, because the mean of its divisors is an integer number (4488885).

Almost surely, 2^17942849 is an apocalyptic number.

It is an amenable number.

17942849 is a deficient number, since it is larger than the sum of its proper divisors (12691).

17942849 is a wasteful number, since it uses less digits than its factorization.

17942849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12690.

The product of its digits is 145152, while the sum is 44.

The square root of 17942849 is about 4235.9000224273. The cubic root of 17942849 is about 261.7964786997.

The spelling of 17942849 in words is "seventeen million, nine hundred forty-two thousand, eight hundred forty-nine".