181673972 has 18 divisors (see below), whose sum is σ = 335545938. Its totient is φ = 86055408.

The previous prime is 181673971. The next prime is 181673977. The reversal of 181673972 is 279376181.

It can be written as a sum of positive squares in only one way, i.e., 99880036 + 81793936 = 9994^2 + 9044^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181673971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61463 + ... + 64350.

It is an arithmetic number, because the mean of its divisors is an integer number (18641441).

Almost surely, 2^181673972 is an apocalyptic number.

It is an amenable number.

181673972 is a deficient number, since it is larger than the sum of its proper divisors (153871966).

181673972 is a wasteful number, since it uses less digits than its factorization.

181673972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125855 (or 125834 counting only the distinct ones).

The product of its digits is 127008, while the sum is 44.

The square root of 181673972 is about 13478.6487453305. The cubic root of 181673972 is about 566.3665170938.

The spelling of 181673972 in words is "one hundred eighty-one million, six hundred seventy-three thousand, nine hundred seventy-two".