3997457 has 2 divisors, whose sum is σ = 3997458. Its totient is φ = 3997456.

The previous prime is 3997453. The next prime is 3997463. The reversal of 3997457 is 7547993.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2989441 + 1008016 = 1729^2 + 1004^2 .

It is an emirp because it is prime and its reverse (7547993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3997457 - 2² = 3997453 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3997453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998728 + 1998729.

It is an arithmetic number, because the mean of its divisors is an integer number (1998729).

Almost surely, 2^3997457 is an apocalyptic number.

It is an amenable number.

3997457 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997457 is an equidigital number, since it uses as much as digits as its factorization.

3997457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 3997457 is about 1999.3641489234. The cubic root of 3997457 is about 158.7064583915.

The spelling of 3997457 in words is "three million, nine hundred ninety-seven thousand, four hundred fifty-seven".