2278139 has 2 divisors, whose sum is σ = 2278140. Its totient is φ = 2278138.

The previous prime is 2278121. The next prime is 2278141. The reversal of 2278139 is 9318722.

2278139 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2278139 - 2⁸ = 2277883 is a prime.

Together with 2278141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2278109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139069 + 1139070.

It is an arithmetic number, because the mean of its divisors is an integer number (1139070).

2^2278139 is an apocalyptic number.

2278139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278139 is an equidigital number, since it uses as much as digits as its factorization.

2278139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 2278139 is about 1509.3505225759. The cubic root of 2278139 is about 131.5810677581.

The spelling of 2278139 in words is "two million, two hundred seventy-eight thousand, one hundred thirty-nine".