2278731 has 32 divisors (see below), whose sum is σ = 3967488. Its totient is φ = 1128960.

The previous prime is 2278729. The next prime is 2278747. The reversal of 2278731 is 1378722.

It is not a de Polignac number, because 2278731 - 2¹ = 2278729 is a prime.

It is a super-2 number, since 2×2278731² = 10385229940722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2278631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4396 + ... + 4886.

It is an arithmetic number, because the mean of its divisors is an integer number (123984).

2^2278731 is an apocalyptic number.

2278731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2278731 is a deficient number, since it is larger than the sum of its proper divisors (1688757).

2278731 is a wasteful number, since it uses less digits than its factorization.

2278731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531.

The product of its digits is 4704, while the sum is 30.

The square root of 2278731 is about 1509.5466206779. The cubic root of 2278731 is about 131.5924643770.

Subtracting from 2278731 its reverse (1378722), we obtain a palindrome (900009).

The spelling of 2278731 in words is "two million, two hundred seventy-eight thousand, seven hundred thirty-one".