2191916 has 24 divisors (see below), whose sum is σ = 4085760. Its totient is φ = 1026000.

The previous prime is 2191883. The next prime is 2191949. The reversal of 2191916 is 6191912.

It is an interprime number because it is at equal distance from previous prime (2191883) and next prime (2191949).

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, 11381 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (170240).

2^2191916 is an apocalyptic number.

It is an amenable number.

2191916 is a deficient number, since it is larger than the sum of its proper divisors (1893844).

2191916 is a wasteful number, since it uses less digits than its factorization.

2191916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 363 counting only the distinct ones).

The product of its digits is 972, while the sum is 29.

The square root of 2191916 is about 1480.5120735745. The cubic root of 2191916 is about 129.8996464178.

The spelling of 2191916 in words is "two million, one hundred ninety-one thousand, nine hundred sixteen".