171397998 has 16 divisors (see below), whose sum is σ = 380884560. Its totient is φ = 57132648.

The previous prime is 171397987. The next prime is 171398011. The reversal of 171397998 is 899793171.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 3174037 = 171397998 / (1 + 7 + 1 + 3 + 9 + 7 + 9 + 9 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586965 + ... + 1587072.

It is an arithmetic number, because the mean of its divisors is an integer number (23805285).

Almost surely, 2^171397998 is an apocalyptic number.

171397998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

171397998 is an abundant number, since it is smaller than the sum of its proper divisors (209486562).

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

171397998 is a wasteful number, since it uses less digits than its factorization.

171397998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174048 (or 3174042 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The square root of 171397998 is about 13091.9058200096. The cubic root of 171397998 is about 555.4801979891.

The spelling of 171397998 in words is "one hundred seventy-one million, three hundred ninety-seven thousand, nine hundred ninety-eight".