2181394467 has 12 divisors (see below), whose sum is σ = 3601032240. Its totient is φ = 1246511088.

The previous prime is 2181394447. The next prime is 2181394477. The reversal of 2181394467 is 7644931812.

2181394467 is a `hidden beast` number, since 2 + 181 + 3 + 9 + 4 + 467 = 666.

It is not a de Polignac number, because 2181394467 - 2¹⁰ = 2181393443 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2181394447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17312592 + ... + 17312717.

It is an arithmetic number, because the mean of its divisors is an integer number (300086020).

Almost surely, 2^2181394467 is an apocalyptic number.

2181394467 is a deficient number, since it is larger than the sum of its proper divisors (1419637773).

2181394467 is a wasteful number, since it uses less digits than its factorization.

2181394467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34625322 (or 34625319 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 2181394467 is about 46705.4008333083. The cubic root of 2181394467 is about 1296.9146688806.

The spelling of 2181394467 in words is "two billion, one hundred eighty-one million, three hundred ninety-four thousand, four hundred sixty-seven".