1821345766 has 16 divisors (see below), whose sum is σ = 2775477744. Its totient is φ = 896241024.

The previous prime is 1821345763. The next prime is 1821345767. The reversal of 1821345766 is 6675431281.

It is a super-2 number, since 2×1821345766² = 6634600798652253512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821345763) 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, 54826 + ... + 81538.

It is an arithmetic number, because the mean of its divisors is an integer number (173467359).

Almost surely, 2^1821345766 is an apocalyptic number.

1821345766 is a deficient number, since it is larger than the sum of its proper divisors (954131978).

1821345766 is a wasteful number, since it uses less digits than its factorization.

1821345766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27255.

The product of its digits is 241920, while the sum is 43.

The square root of 1821345766 is about 42677.2277215847. The cubic root of 1821345766 is about 1221.2300069119.

The spelling of 1821345766 in words is "one billion, eight hundred twenty-one million, three hundred forty-five thousand, seven hundred sixty-six".