1816771912 has 24 divisors (see below), whose sum is σ = 3618618210. Its totient is φ = 854950400.

The previous prime is 1816771907. The next prime is 1816771919. The reversal of 1816771912 is 2191776181.

It can be written as a sum of positive squares in 3 ways, for example, as 1618131076 + 198640836 = 40226^2 + 14094^2 .

It is not an unprimeable number, because it can be changed into a prime (1816771919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390589 + ... + 395212.

Almost surely, 2^1816771912 is an apocalyptic number.

It is an amenable number.

1816771912 is a deficient number, since it is larger than the sum of its proper divisors (1801846298).

1816771912 is a wasteful number, since it uses less digits than its factorization.

1816771912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785841 (or 785820 counting only the distinct ones).

The product of its digits is 42336, while the sum is 43.

The square root of 1816771912 is about 42623.6074493936. The cubic root of 1816771912 is about 1220.2068788290.

The spelling of 1816771912 in words is "one billion, eight hundred sixteen million, seven hundred seventy-one thousand, nine hundred twelve".