2156774 has 4 divisors (see below), whose sum is σ = 3235164. Its totient is φ = 1078386.

The previous prime is 2156761. The next prime is 2156789. The reversal of 2156774 is 4776512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2156774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539192 + ... + 539195.

It is an arithmetic number, because the mean of its divisors is an integer number (808791).

2^2156774 is an apocalyptic number.

2156774 is a deficient number, since it is larger than the sum of its proper divisors (1078390).

2156774 is a wasteful number, since it uses less digits than its factorization.

2156774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078389.

The product of its digits is 11760, while the sum is 32.

The square root of 2156774 is about 1468.5959280891. The cubic root of 2156774 is about 129.2016955753.

The spelling of 2156774 in words is "two million, one hundred fifty-six thousand, seven hundred seventy-four".