2991923 has 8 divisors (see below), whose sum is σ = 3297456. Its totient is φ = 2692000.

The previous prime is 2991917. The next prime is 2991929. The reversal of 2991923 is 3291992.

It is an interprime number because it is at equal distance from previous prime (2991917) and next prime (2991929).

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

It is a cyclic number.

It is not a de Polignac number, because 2991923 - 2⁴ = 2991907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991929) 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 7 ways as a sum of consecutive naturals, for example, 236 + ... + 2457.

It is an arithmetic number, because the mean of its divisors is an integer number (412182).

2^2991923 is an apocalyptic number.

2991923 is a deficient number, since it is larger than the sum of its proper divisors (305533).

2991923 is a wasteful number, since it uses less digits than its factorization.

2991923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805.

The product of its digits is 8748, while the sum is 35.

The square root of 2991923 is about 1729.7176070099. The cubic root of 2991923 is about 144.0954068105.

It can be divided in two parts, 299 and 1923, that added together give a palindrome (2222).

The spelling of 2991923 in words is "two million, nine hundred ninety-one thousand, nine hundred twenty-three".