17982947 has 4 divisors (see below), whose sum is σ = 17991456. Its totient is φ = 17974440.

The previous prime is 17982931. The next prime is 17982961. The reversal of 17982947 is 74928971.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 17982947 - 2⁴ = 17982931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17982907) 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, 1622 + ... + 6212.

It is an arithmetic number, because the mean of its divisors is an integer number (4497864).

Almost surely, 2^17982947 is an apocalyptic number.

17982947 is a deficient number, since it is larger than the sum of its proper divisors (8509).

17982947 is an equidigital number, since it uses as much as digits as its factorization.

17982947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8508.

The product of its digits is 254016, while the sum is 47.

The square root of 17982947 is about 4240.6304955749. The cubic root of 17982947 is about 261.9913512286.

The spelling of 17982947 in words is "seventeen million, nine hundred eighty-two thousand, nine hundred forty-seven".