171978873 has 24 divisors (see below), whose sum is σ = 252908544. Its totient is φ = 103873440.

The previous prime is 171978847. The next prime is 171978893. The reversal of 171978873 is 378879171.

It is a happy number.

It is not a de Polignac number, because 171978873 - 2⁸ = 171978617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171978803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138411 + ... + 139647.

It is an arithmetic number, because the mean of its divisors is an integer number (10537856).

Almost surely, 2^171978873 is an apocalyptic number.

It is an amenable number.

171978873 is a deficient number, since it is larger than the sum of its proper divisors (80929671).

171978873 is a wasteful number, since it uses less digits than its factorization.

171978873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1634 counting only the distinct ones).

The product of its digits is 592704, while the sum is 51.

The square root of 171978873 is about 13114.0715645447. The cubic root of 171978873 is about 556.1070056543.

The spelling of 171978873 in words is "one hundred seventy-one million, nine hundred seventy-eight thousand, eight hundred seventy-three".