172673986 has 4 divisors (see below), whose sum is σ = 259010982. Its totient is φ = 86336992.

The previous prime is 172673929. The next prime is 172674023. The reversal of 172673986 is 689376271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689376271 = 277 ⋅2488723.

It can be written as a sum of positive squares in only one way, i.e., 172003225 + 670761 = 13115^2 + 819^2 .

It is a super-2 number, since 2×172673986² = 59632610882256392, 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43168495 + ... + 43168498.

Almost surely, 2^172673986 is an apocalyptic number.

172673986 is a deficient number, since it is larger than the sum of its proper divisors (86336996).

172673986 is an equidigital number, since it uses as much as digits as its factorization.

172673986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86336995.

The product of its digits is 762048, while the sum is 49.

The square root of 172673986 is about 13140.5474010788. The cubic root of 172673986 is about 556.8552323916.

The spelling of 172673986 in words is "one hundred seventy-two million, six hundred seventy-three thousand, nine hundred eighty-six".