181406906 has 16 divisors (see below), whose sum is σ = 275907816. Its totient is φ = 89446656.

The previous prime is 181406899. The next prime is 181406909. The reversal of 181406906 is 609604181.

It can be written as a sum of positive squares in 4 ways, for example, as 171741025 + 9665881 = 13105^2 + 3109^2 .

It is not an unprimeable number, because it can be changed into a prime (181406909) 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, 40910 + ... + 45126.

Almost surely, 2^181406906 is an apocalyptic number.

181406906 is a deficient number, since it is larger than the sum of its proper divisors (94500910).

181406906 is a wasteful number, since it uses less digits than its factorization.

181406906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 181406906 is about 13468.7380997627. The cubic root of 181406906 is about 566.0888559321.

The spelling of 181406906 in words is "one hundred eighty-one million, four hundred six thousand, nine hundred six".