2278457 has 4 divisors (see below), whose sum is σ = 2285556. Its totient is φ = 2271360.

The previous prime is 2278453. The next prime is 2278477. The reversal of 2278457 is 7548722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7548722 = 2 ⋅3774361.

It can be written as a sum of positive squares in 2 ways, for example, as 1229881 + 1048576 = 1109^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278457 - 2² = 2278453 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 2²⁰ + 7⁴ + 8⁴ + 4⁵ + 5⁸ + 7⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278453) 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, 3044 + ... + 3717.

It is an arithmetic number, because the mean of its divisors is an integer number (571389).

2^2278457 is an apocalyptic number.

It is an amenable number.

2278457 is a deficient number, since it is larger than the sum of its proper divisors (7099).

2278457 is an equidigital number, since it uses as much as digits as its factorization.

2278457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7098.

The product of its digits is 31360, while the sum is 35.

The square root of 2278457 is about 1509.4558622232. The cubic root of 2278457 is about 131.5871898359.

The spelling of 2278457 in words is "two million, two hundred seventy-eight thousand, four hundred fifty-seven".