171918942 has 64 divisors (see below), whose sum is σ = 380170560. Its totient is φ = 51508224.

The previous prime is 171918941. The next prime is 171918949. The reversal of 171918942 is 249819171.

It is a super-2 number, since 2×171918942² = 59112245236798728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 171918894 and 171918903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171918941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 620508 + ... + 620784.

It is an arithmetic number, because the mean of its divisors is an integer number (5940165).

Almost surely, 2^171918942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171918942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190085280).

171918942 is an abundant number, since it is smaller than the sum of its proper divisors (208251618).

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

171918942 is a wasteful number, since it uses less digits than its factorization.

171918942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its digits is 36288, while the sum is 42.

The square root of 171918942 is about 13111.7863771494. The cubic root of 171918942 is about 556.0424009725.

The spelling of 171918942 in words is "one hundred seventy-one million, nine hundred eighteen thousand, nine hundred forty-two".