181672 has 8 divisors (see below), whose sum is σ = 340650. Its totient is φ = 90832.

The previous prime is 181669. The next prime is 181693. The reversal of 181672 is 276181.

It can be written as a sum of positive squares in only one way, i.e., 181476 + 196 = 426^2 + 14^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11347 + ... + 11362.

2¹⁸¹⁶⁷² is an apocalyptic number.

It is an amenable number.

181672 is a deficient number, since it is larger than the sum of its proper divisors (158978).

181672 is a wasteful number, since it uses less digits than its factorization.

181672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22715 (or 22711 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 181672 is about 426.2299848673. The cubic root of 181672 is about 56.6364467857.

The spelling of 181672 in words is "one hundred eighty-one thousand, six hundred seventy-two".