2291978 has 12 divisors (see below), whose sum is σ = 3723318. Its totient is φ = 1057680.

The previous prime is 2291963. The next prime is 2291983. The reversal of 2291978 is 8791922.

It can be written as a sum of positive squares in 3 ways, for example, as 1075369 + 1216609 = 1037^2 + 1103^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3053 + ... + 3728.

2^2291978 is an apocalyptic number.

2291978 is a deficient number, since it is larger than the sum of its proper divisors (1431340).

2291978 is a wasteful number, since it uses less digits than its factorization.

2291978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809 (or 6796 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 2291978 is about 1513.9280035722. The cubic root of 2291978 is about 131.8469683537.

The spelling of 2291978 in words is "two million, two hundred ninety-one thousand, nine hundred seventy-eight".