2278949 has 2 divisors, whose sum is σ = 2278950. Its totient is φ = 2278948.

The previous prime is 2278943. The next prime is 2278961. The reversal of 2278949 is 9498722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 13924 = 1505^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278949 - 2⁸ = 2278693 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2278943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139474 + 1139475.

It is an arithmetic number, because the mean of its divisors is an integer number (1139475).

2^2278949 is an apocalyptic number.

It is an amenable number.

2278949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278949 is an equidigital number, since it uses as much as digits as its factorization.

2278949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 2278949 is about 1509.6188260617. The cubic root of 2278949 is about 131.5966606076.

The spelling of 2278949 in words is "two million, two hundred seventy-eight thousand, nine hundred forty-nine".