172947982 has 4 divisors (see below), whose sum is σ = 259421976. Its totient is φ = 86473990.

The previous prime is 172947979. The next prime is 172947989. The reversal of 172947982 is 289749271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 289749271 = 7 ⋅41392753.

It is a super-2 number, since 2×172947982² = 59822008955744648, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172947989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43236994 + ... + 43236997.

It is an arithmetic number, because the mean of its divisors is an integer number (64855494).

Almost surely, 2^172947982 is an apocalyptic number.

172947982 is a deficient number, since it is larger than the sum of its proper divisors (86473994).

172947982 is an equidigital number, since it uses as much as digits as its factorization.

172947982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86473993.

The product of its digits is 508032, while the sum is 49.

The square root of 172947982 is about 13150.9688616467. The cubic root of 172947982 is about 557.1496127229.

The spelling of 172947982 in words is "one hundred seventy-two million, nine hundred forty-seven thousand, nine hundred eighty-two".