171193990 has 64 divisors (see below), whose sum is σ = 357799680. Its totient is φ = 58320000.

The previous prime is 171193973. The next prime is 171194017. The reversal of 171193990 is 99391171.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210685 + ... + 211495.

It is an arithmetic number, because the mean of its divisors is an integer number (5590620).

Almost surely, 2^171193990 is an apocalyptic number.

171193990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

171193990 is an abundant number, since it is smaller than the sum of its proper divisors (186605690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171193990 is a wasteful number, since it uses less digits than its factorization.

171193990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 171193990 is about 13084.1121211949. The cubic root of 171193990 is about 555.2597220669.

The spelling of 171193990 in words is "one hundred seventy-one million, one hundred ninety-three thousand, nine hundred ninety".