2204399781 has 12 divisors (see below), whose sum is σ = 3251881152. Its totient is φ = 1438331496.

The previous prime is 2204399777. The next prime is 2204399839. The reversal of 2204399781 is 1879934022.

It is not a de Polignac number, because 2204399781 - 2² = 2204399777 is a prime.

It is a super-2 number, since 2×2204399781² = 9718756788945695922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2204391781) 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, 2605251 + ... + 2606096.

It is an arithmetic number, because the mean of its divisors is an integer number (270990096).

Almost surely, 2^2204399781 is an apocalyptic number.

It is an amenable number.

2204399781 is a deficient number, since it is larger than the sum of its proper divisors (1047481371).

2204399781 is a wasteful number, since it uses less digits than its factorization.

2204399781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211400 (or 5211397 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 2204399781 is about 46951.0359949597. The cubic root of 2204399781 is about 1301.4578873182.

The spelling of 2204399781 in words is "two billion, two hundred four million, three hundred ninety-nine thousand, seven hundred eighty-one".