1811971962 has 24 divisors (see below), whose sum is σ = 4156877556. Its totient is φ = 568461696.

The previous prime is 1811971949. The next prime is 1811971963. The reversal of 1811971962 is 2691791181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1775863881 + 36108081 = 42141^2 + 6009^2 .

It is not an unprimeable number, because it can be changed into a prime (1811971963) 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, 2960433 + ... + 2961044.

Almost surely, 2^1811971962 is an apocalyptic number.

1811971962 is an abundant number, since it is smaller than the sum of its proper divisors (2344905594).

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

1811971962 is a wasteful number, since it uses less digits than its factorization.

1811971962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921502 (or 5921499 counting only the distinct ones).

The product of its digits is 54432, while the sum is 45.

The square root of 1811971962 is about 42567.2639712726. The cubic root of 1811971962 is about 1219.1313268936.

The spelling of 1811971962 in words is "one billion, eight hundred eleven million, nine hundred seventy-one thousand, nine hundred sixty-two".