181216746 has 12 divisors (see below), whose sum is σ = 392636322. Its totient is φ = 60405576.

The previous prime is 181216697. The next prime is 181216769. The reversal of 181216746 is 647612181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 181198521 + 18225 = 13461^2 + 135^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181216746.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5033781 + ... + 5033816.

Almost surely, 2^181216746 is an apocalyptic number.

181216746 is an abundant number, since it is smaller than the sum of its proper divisors (211419576).

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

181216746 is a wasteful number, since it uses less digits than its factorization.

181216746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10067605 (or 10067602 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 181216746 is about 13461.6769386284. The cubic root of 181216746 is about 565.8909856764.

The spelling of 181216746 in words is "one hundred eighty-one million, two hundred sixteen thousand, seven hundred forty-six".