3157897 has 4 divisors (see below), whose sum is σ = 3266820. Its totient is φ = 3048976.

The previous prime is 3157879. The next prime is 3157919. The reversal of 3157897 is 7987513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7987513 = 607 ⋅13159.

It can be written as a sum of positive squares in 2 ways, for example, as 1547536 + 1610361 = 1244^2 + 1269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3157897 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3157807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54418 + ... + 54475.

It is an arithmetic number, because the mean of its divisors is an integer number (816705).

Almost surely, 2^3157897 is an apocalyptic number.

It is an amenable number.

3157897 is a deficient number, since it is larger than the sum of its proper divisors (108923).

3157897 is a wasteful number, since it uses less digits than its factorization.

3157897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108922.

The product of its digits is 52920, while the sum is 40.

The square root of 3157897 is about 1777.0472700522. The cubic root of 3157897 is about 146.7121180300.

The spelling of 3157897 in words is "three million, one hundred fifty-seven thousand, eight hundred ninety-seven".