1991941960 has 32 divisors (see below), whose sum is σ = 4523765760. Its totient is φ = 789328576.

The previous prime is 1991941943. The next prime is 1991941967. The reversal of 1991941960 is 691491991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1991941967) 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, 228424 + ... + 236983.

It is an arithmetic number, because the mean of its divisors is an integer number (141367680).

Almost surely, 2^1991941960 is an apocalyptic number.

1991941960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1991941960 is an abundant number, since it is smaller than the sum of its proper divisors (2531823800).

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

1991941960 is a wasteful number, since it uses less digits than its factorization.

1991941960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465525 (or 465521 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 1991941960 is about 44631.1769954591. The cubic root of 1991941960 is about 1258.2266899472.

The spelling of 1991941960 in words is "one billion, nine hundred ninety-one million, nine hundred forty-one thousand, nine hundred sixty".