2991963 has 8 divisors (see below), whose sum is σ = 4296208. Its totient is φ = 1841184.

The previous prime is 2991929. The next prime is 2991971. The reversal of 2991963 is 3691992.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2991963 - 2⁶ = 2991899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 76717 = 2991963 / (2 + 9 + 9 + 1 + 9 + 6 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991463) 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, 38320 + ... + 38397.

It is an arithmetic number, because the mean of its divisors is an integer number (537026).

2^2991963 is an apocalyptic number.

2991963 is a deficient number, since it is larger than the sum of its proper divisors (1304245).

2991963 is a wasteful number, since it uses less digits than its factorization.

2991963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76733.

The product of its digits is 26244, while the sum is 39.

The square root of 2991963 is about 1729.7291695523. The cubic root of 2991963 is about 144.0960489606.

The spelling of 2991963 in words is "two million, nine hundred ninety-one thousand, nine hundred sixty-three".