161742 has 16 divisors (see below), whose sum is σ = 369792. Its totient is φ = 46200.

The previous prime is 161741. The next prime is 161743. The reversal of 161742 is 247161.

It is an interprime number because it is at equal distance from previous prime (161741) and next prime (161743).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1884 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (23112).

2¹⁶¹⁷⁴² is an apocalyptic number.

161742 is an abundant number, since it is smaller than the sum of its proper divisors (208050).

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

161742 is a wasteful number, since it uses less digits than its factorization.

161742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863.

The product of its digits is 336, while the sum is 21.

The square root of 161742 is about 402.1716051638. The cubic root of 161742 is about 54.4846630805.

It can be divided in two parts, 161 and 742, that added together give a triangular number (903 = T₄₂).

The spelling of 161742 in words is "one hundred sixty-one thousand, seven hundred forty-two".