2278745 has 24 divisors (see below), whose sum is σ = 3250368. Its totient is φ = 1528800.

The previous prime is 2278729. The next prime is 2278747. The reversal of 2278745 is 5478722.

It is not a de Polignac number, because 2278745 - 2⁴ = 2278729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2278747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17330 + ... + 17460.

It is an arithmetic number, because the mean of its divisors is an integer number (135432).

2^2278745 is an apocalyptic number.

It is an amenable number.

2278745 is a deficient number, since it is larger than the sum of its proper divisors (971623).

2278745 is a wasteful number, since it uses less digits than its factorization.

2278745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 214 counting only the distinct ones).

The product of its digits is 31360, while the sum is 35.

The square root of 2278745 is about 1509.5512578247. The cubic root of 2278745 is about 131.5927338677.

The spelling of 2278745 in words is "two million, two hundred seventy-eight thousand, seven hundred forty-five".