1822581994 has 4 divisors (see below), whose sum is σ = 2733872994. Its totient is φ = 911290996.

The previous prime is 1822581989. The next prime is 1822581997. The reversal of 1822581994 is 4991852281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1000899769 + 821682225 = 31637^2 + 28665^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1822581997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455645497 + ... + 455645500.

Almost surely, 2^1822581994 is an apocalyptic number.

1822581994 is a deficient number, since it is larger than the sum of its proper divisors (911291000).

1822581994 is an equidigital number, since it uses as much as digits as its factorization.

1822581994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911290999.

The product of its digits is 414720, while the sum is 49.

The square root of 1822581994 is about 42691.7087266368. The cubic root of 1822581994 is about 1221.5062453789.

The spelling of 1822581994 in words is "one billion, eight hundred twenty-two million, five hundred eighty-one thousand, nine hundred ninety-four".