3897404809 has 4 divisors (see below), whose sum is σ = 4066857216. Its totient is φ = 3727952404.

The previous prime is 3897404789. The next prime is 3897404813. The reversal of 3897404809 is 9084047983.

3897404809 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3897404809 - 2⁹ = 3897404297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3897404899) 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, 84726169 + ... + 84726214.

It is an arithmetic number, because the mean of its divisors is an integer number (1016714304).

Almost surely, 2^3897404809 is an apocalyptic number.

It is an amenable number.

3897404809 is a deficient number, since it is larger than the sum of its proper divisors (169452407).

3897404809 is a wasteful number, since it uses less digits than its factorization.

3897404809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169452406.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 3897404809 is about 62429.1983690324. The cubic root of 3897404809 is about 1573.7116948233.

The spelling of 3897404809 in words is "three billion, eight hundred ninety-seven million, four hundred four thousand, eight hundred nine".