181973964 has 12 divisors (see below), whose sum is σ = 424605944. Its totient is φ = 60657984.

The previous prime is 181973951. The next prime is 181973969. The reversal of 181973964 is 469379181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×181973964² = 66229047147746592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181973969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7582237 + ... + 7582260.

Almost surely, 2^181973964 is an apocalyptic number.

It is an amenable number.

181973964 is an abundant number, since it is smaller than the sum of its proper divisors (242631980).

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

181973964 is a wasteful number, since it uses less digits than its factorization.

181973964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15164504 (or 15164502 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 181973964 is about 13489.7725703586. The cubic root of 181973964 is about 566.6780861982.

The spelling of 181973964 in words is "one hundred eighty-one million, nine hundred seventy-three thousand, nine hundred sixty-four".