3897405 has 24 divisors (see below), whose sum is σ = 6801912. Its totient is φ = 2064384.

The previous prime is 3897401. The next prime is 3897407. The reversal of 3897405 is 5047983.

It can be written as a sum of positive squares in 4 ways, for example, as 1004004 + 2893401 = 1002^2 + 1701^2 .

It is not a de Polignac number, because 3897405 - 2² = 3897401 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3897405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11397 + ... + 11733.

It is an arithmetic number, because the mean of its divisors is an integer number (283413).

Almost surely, 2^3897405 is an apocalyptic number.

It is an amenable number.

3897405 is a deficient number, since it is larger than the sum of its proper divisors (2904507).

3897405 is a wasteful number, since it uses less digits than its factorization.

3897405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 3897405 is about 1974.1846418205. The cubic root of 3897405 is about 157.3711720531.

The spelling of 3897405 in words is "three million, eight hundred ninety-seven thousand, four hundred five".