3997157 has 8 divisors (see below), whose sum is σ = 4157400. Its totient is φ = 3838464.

The previous prime is 3997141. The next prime is 3997181. The reversal of 3997157 is 7517993.

It can be written as a sum of positive squares in 4 ways, for example, as 1018081 + 2979076 = 1009^2 + 1726^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3997157 - 2⁴ = 3997141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9569 + ... + 9977.

It is an arithmetic number, because the mean of its divisors is an integer number (519675).

Almost surely, 2^3997157 is an apocalyptic number.

It is an amenable number.

3997157 is a deficient number, since it is larger than the sum of its proper divisors (160243).

3997157 is a wasteful number, since it uses less digits than its factorization.

3997157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its digits is 59535, while the sum is 41.

The square root of 3997157 is about 1999.2891236637. The cubic root of 3997157 is about 158.7024881067.

The spelling of 3997157 in words is "three million, nine hundred ninety-seven thousand, one hundred fifty-seven".