2161456 has 20 divisors (see below), whose sum is σ = 4568904. Its totient is φ = 982400.

The previous prime is 2161447. The next prime is 2161469. The reversal of 2161456 is 6541612.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2161456.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5965 + ... + 6316.

2^2161456 is an apocalyptic number.

It is an amenable number.

2161456 is an abundant number, since it is smaller than the sum of its proper divisors (2407448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161456 is a wasteful number, since it uses less digits than its factorization.

2161456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12300 (or 12294 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 2161456 is about 1470.1891034829. The cubic root of 2161456 is about 129.2951198496.

The spelling of 2161456 in words is "two million, one hundred sixty-one thousand, four hundred fifty-six".