3994481569 has 4 divisors (see below), whose sum is σ = 4301749396. Its totient is φ = 3687213744.

The previous prime is 3994481567. The next prime is 3994481629. The reversal of 3994481569 is 9651844993.

3994481569 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1525683600 + 2468797969 = 39060^2 + 49687^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994481569 - 2¹ = 3994481567 is a prime.

It is a super-2 number, since 2×3994481569² = 31911766010161403522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3994481567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153633894 + ... + 153633919.

It is an arithmetic number, because the mean of its divisors is an integer number (1075437349).

Almost surely, 2^3994481569 is an apocalyptic number.

It is an amenable number.

3994481569 is a deficient number, since it is larger than the sum of its proper divisors (307267827).

3994481569 is a wasteful number, since it uses less digits than its factorization.

3994481569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307267826.

The product of its digits is 8398080, while the sum is 58.

The square root of 3994481569 is about 63201.9111182565. The cubic root of 3994481569 is about 1586.6707190763.

The spelling of 3994481569 in words is "three billion, nine hundred ninety-four million, four hundred eighty-one thousand, five hundred sixty-nine".