2171397 has 4 divisors (see below), whose sum is σ = 2895200. Its totient is φ = 1447596.

The previous prime is 2171387. The next prime is 2171431. The reversal of 2171397 is 7931712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2171397 - 2¹⁵ = 2138629 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171347) 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, 361897 + ... + 361902.

It is an arithmetic number, because the mean of its divisors is an integer number (723800).

2^2171397 is an apocalyptic number.

It is an amenable number.

2171397 is a deficient number, since it is larger than the sum of its proper divisors (723803).

2171397 is an equidigital number, since it uses as much as digits as its factorization.

2171397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723802.

The product of its digits is 2646, while the sum is 30.

The square root of 2171397 is about 1473.5660826716. The cubic root of 2171397 is about 129.4930354081.

The spelling of 2171397 in words is "two million, one hundred seventy-one thousand, three hundred ninety-seven".