2278642 has 4 divisors (see below), whose sum is σ = 3417966. Its totient is φ = 1139320.

The previous prime is 2278637. The next prime is 2278643. The reversal of 2278642 is 2468722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1320201 + 958441 = 1149^2 + 979^2 .

It is not an unprimeable number, because it can be changed into a prime (2278643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569659 + ... + 569662.

2^2278642 is an apocalyptic number.

2278642 is a deficient number, since it is larger than the sum of its proper divisors (1139324).

2278642 is a wasteful number, since it uses less digits than its factorization.

2278642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139323.

The product of its digits is 10752, while the sum is 31.

The square root of 2278642 is about 1509.5171413402. The cubic root of 2278642 is about 131.5907511600.

The spelling of 2278642 in words is "two million, two hundred seventy-eight thousand, six hundred forty-two".