2278538 has 4 divisors (see below), whose sum is σ = 3417810. Its totient is φ = 1139268.

The previous prime is 2278519. The next prime is 2278543. The reversal of 2278538 is 8358722.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8358722 = 2 ⋅4179361.

It can be written as a sum of positive squares in only one way, i.e., 1481089 + 797449 = 1217^2 + 893^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2278498 and 2278507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569633 + ... + 569636.

2^2278538 is an apocalyptic number.

2278538 is a deficient number, since it is larger than the sum of its proper divisors (1139272).

2278538 is a wasteful number, since it uses less digits than its factorization.

2278538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139271.

The product of its digits is 26880, while the sum is 35.

The square root of 2278538 is about 1509.4826928455. The cubic root of 2278538 is about 131.5887491421.

The spelling of 2278538 in words is "two million, two hundred seventy-eight thousand, five hundred thirty-eight".