2279781 has 12 divisors (see below), whose sum is σ = 3763552. Its totient is φ = 1302696.

The previous prime is 2279773. The next prime is 2279807. The reversal of 2279781 is 1879722.

It is not a de Polignac number, because 2279781 - 2³ = 2279773 is a prime.

It is a super-2 number, since 2×2279781² = 10394802815922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2279741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18031 + ... + 18156.

2^2279781 is an apocalyptic number.

2279781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2279781 is a deficient number, since it is larger than the sum of its proper divisors (1483771).

2279781 is a wasteful number, since it uses less digits than its factorization.

2279781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36200 (or 36197 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2279781 is about 1509.8943671661. The cubic root of 2279781 is about 131.6126731204.

The spelling of 2279781 in words is "two million, two hundred seventy-nine thousand, seven hundred eighty-one".