2142278 has 4 divisors (see below), whose sum is σ = 3213420. Its totient is φ = 1071138.

The previous prime is 2142271. The next prime is 2142281. The reversal of 2142278 is 8722412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535568 + ... + 535571.

It is an arithmetic number, because the mean of its divisors is an integer number (803355).

2^2142278 is an apocalyptic number.

2142278 is a deficient number, since it is larger than the sum of its proper divisors (1071142).

2142278 is a wasteful number, since it uses less digits than its factorization.

2142278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071141.

The product of its digits is 1792, while the sum is 26.

The square root of 2142278 is about 1463.6522811105. The cubic root of 2142278 is about 128.9115833447.

The spelling of 2142278 in words is "two million, one hundred forty-two thousand, two hundred seventy-eight".