171155420 has 48 divisors (see below), whose sum is σ = 394813440. Its totient is φ = 62035776.

The previous prime is 171155417. The next prime is 171155431. The reversal of 171155420 is 24551171.

It is a self number, because there is not a number n which added to its sum of digits gives 171155420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1052 + ... + 18531.

It is an arithmetic number, because the mean of its divisors is an integer number (8225280).

Almost surely, 2^171155420 is an apocalyptic number.

171155420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171155420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197406720).

171155420 is an abundant number, since it is smaller than the sum of its proper divisors (223658020).

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

171155420 is a wasteful number, since it uses less digits than its factorization.

171155420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19634 (or 19632 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 171155420 is about 13082.6381131636. The cubic root of 171155420 is about 555.2180189362.

The spelling of 171155420 in words is "one hundred seventy-one million, one hundred fifty-five thousand, four hundred twenty".