3947397 has 12 divisors (see below), whose sum is σ = 5355264. Its totient is φ = 2586280.

The previous prime is 3947369. The next prime is 3947401. The reversal of 3947397 is 7937493.

It is not a de Polignac number, because 3947397 - 2¹¹ = 3945349 is a prime.

3947397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20572 + ... + 20762.

It is an arithmetic number, because the mean of its divisors is an integer number (446272).

Almost surely, 2^3947397 is an apocalyptic number.

It is an amenable number.

3947397 is a deficient number, since it is larger than the sum of its proper divisors (1407867).

3947397 is an equidigital number, since it uses as much as digits as its factorization.

3947397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 277 counting only the distinct ones).

The product of its digits is 142884, while the sum is 42.

The square root of 3947397 is about 1986.8057277952. The cubic root of 3947397 is about 158.0411819160.

The spelling of 3947397 in words is "three million, nine hundred forty-seven thousand, three hundred ninety-seven".