171256140 has 144 divisors (see below), whose sum is σ = 585859680. Its totient is φ = 41500800.

The previous prime is 171256117. The next prime is 171256153. The reversal of 171256140 is 41652171.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64030 + ... + 66650.

It is an arithmetic number, because the mean of its divisors is an integer number (4068470).

Almost surely, 2^171256140 is an apocalyptic number.

171256140 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 171256140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292929840).

171256140 is an abundant number, since it is smaller than the sum of its proper divisors (414603540).

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

171256140 is a wasteful number, since it uses less digits than its factorization.

171256140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 171256140 is about 13086.4869235406. The cubic root of 171256140 is about 555.3269074794.

It can be divided in two parts, 171256 and 140, that added together give a square (171396 = 414²).

The spelling of 171256140 in words is "one hundred seventy-one million, two hundred fifty-six thousand, one hundred forty".