2028457 has 4 divisors (see below), whose sum is σ = 2147796. Its totient is φ = 1909120.

The previous prime is 2028443. The next prime is 2028461. The reversal of 2028457 is 7548202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7548202 = 2 ⋅3774101.

It can be written as a sum of positive squares in 2 ways, for example, as 1687401 + 341056 = 1299^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 2028457 - 2⁷ = 2028329 is a prime.

It is a super-2 number, since 2×2028457² = 8229275601698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59644 + ... + 59677.

It is an arithmetic number, because the mean of its divisors is an integer number (536949).

2^2028457 is an apocalyptic number.

It is an amenable number.

2028457 is a deficient number, since it is larger than the sum of its proper divisors (119339).

2028457 is a wasteful number, since it uses less digits than its factorization.

2028457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119338.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 2028457 is about 1424.2390950960. The cubic root of 2028457 is about 126.5868526121.

It can be divided in two parts, 2028 and 457, that added together give a triangular number (2485 = T₇₀).

The spelling of 2028457 in words is "two million, twenty-eight thousand, four hundred fifty-seven".