2991406 has 16 divisors (see below), whose sum is σ = 4924800. Its totient is φ = 1351480.

The previous prime is 2991397. The next prime is 2991421. The reversal of 2991406 is 6041992.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4695 + ... + 5293.

It is an arithmetic number, because the mean of its divisors is an integer number (307800).

2^2991406 is an apocalyptic number.

2991406 is a deficient number, since it is larger than the sum of its proper divisors (1933394).

2991406 is a wasteful number, since it uses less digits than its factorization.

2991406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2991406 is about 1729.5681541934. The cubic root of 2991406 is about 144.0871065059.

The spelling of 2991406 in words is "two million, nine hundred ninety-one thousand, four hundred six".