3994385261 has 2 divisors, whose sum is σ = 3994385262. Its totient is φ = 3994385260.

The previous prime is 3994385243. The next prime is 3994385273. The reversal of 3994385261 is 1625834993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2913948361 + 1080436900 = 53981^2 + 32870^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994385261 - 2²² = 3990190957 is a prime.

It is a super-2 number, since 2×3994385261² = 31910227226588076242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3994385231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997192630 + 1997192631.

It is an arithmetic number, because the mean of its divisors is an integer number (1997192631).

Almost surely, 2^3994385261 is an apocalyptic number.

It is an amenable number.

3994385261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994385261 is an equidigital number, since it uses as much as digits as its factorization.

3994385261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 3994385261 is about 63201.1492063238. The cubic root of 3994385261 is about 1586.6579672912.

The spelling of 3994385261 in words is "three billion, nine hundred ninety-four million, three hundred eighty-five thousand, two hundred sixty-one".