2145856 has 14 divisors (see below), whose sum is σ = 4258310. Its totient is φ = 1072896.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145856 is 6585412.

It can be written as a sum of positive squares in only one way, i.e., 1915456 + 230400 = 1384^2 + 480^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2145853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16701 + ... + 16828.

It is an arithmetic number, because the mean of its divisors is an integer number (304165).

2^2145856 is an apocalyptic number.

It is an amenable number.

2145856 is a deficient number, since it is larger than the sum of its proper divisors (2112454).

2145856 is an equidigital number, since it uses as much as digits as its factorization.

2145856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33541 (or 33531 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 2145856 is about 1464.8740560198. The cubic root of 2145856 is about 128.9833121453.

The spelling of 2145856 in words is "two million, one hundred forty-five thousand, eight hundred fifty-six".