2991947 has 4 divisors (see below), whose sum is σ = 3419376. Its totient is φ = 2564520.

The previous prime is 2991929. The next prime is 2991971. The reversal of 2991947 is 7491992.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2991947 - 2⁶ = 2991883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213704 + ... + 213717.

It is an arithmetic number, because the mean of its divisors is an integer number (854844).

2^2991947 is an apocalyptic number.

2991947 is a deficient number, since it is larger than the sum of its proper divisors (427429).

2991947 is an equidigital number, since it uses as much as digits as its factorization.

2991947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427428.

The product of its digits is 40824, while the sum is 41.

The square root of 2991947 is about 1729.7245445446. The cubic root of 2991947 is about 144.0957921012.

The spelling of 2991947 in words is "two million, nine hundred ninety-one thousand, nine hundred forty-seven".