3897945 has 48 divisors (see below), whose sum is σ = 7338240. Its totient is φ = 1907712.

The previous prime is 3897941. The next prime is 3897967. The reversal of 3897945 is 5497983.

It is not a de Polignac number, because 3897945 - 2² = 3897941 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3897945.

It is not an unprimeable number, because it can be changed into a prime (3897941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40137 + ... + 40233.

It is an arithmetic number, because the mean of its divisors is an integer number (152880).

Almost surely, 2^3897945 is an apocalyptic number.

It is an amenable number.

3897945 is a deficient number, since it is larger than the sum of its proper divisors (3440295).

3897945 is a wasteful number, since it uses less digits than its factorization.

3897945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 171 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 3897945 is about 1974.3214024064. The cubic root of 3897945 is about 157.3784398384.

The spelling of 3897945 in words is "three million, eight hundred ninety-seven thousand, nine hundred forty-five".