1961806988 has 12 divisors (see below), whose sum is σ = 3582430320. Its totient is φ = 938255472.

The previous prime is 1961806939. The next prime is 1961806999. The reversal of 1961806988 is 8896081691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10661903 + ... + 10662086.

It is an arithmetic number, because the mean of its divisors is an integer number (298535860).

Almost surely, 2^1961806988 is an apocalyptic number.

It is an amenable number.

1961806988 is a deficient number, since it is larger than the sum of its proper divisors (1620623332).

1961806988 is a wasteful number, since it uses less digits than its factorization.

1961806988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21324016 (or 21324014 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 1961806988 is about 44292.2903900893. The cubic root of 1961806988 is about 1251.8494198076.

The spelling of 1961806988 in words is "one billion, nine hundred sixty-one million, eight hundred six thousand, nine hundred eighty-eight".