2159397 has 6 divisors (see below), whose sum is σ = 3119142. Its totient is φ = 1439592.

The previous prime is 2159383. The next prime is 2159419. The reversal of 2159397 is 7939512.

It can be written as a sum of positive squares in only one way, i.e., 2056356 + 103041 = 1434^2 + 321^2 .

It is not a de Polignac number, because 2159397 - 2²⁰ = 1110821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119958 + ... + 119975.

It is an arithmetic number, because the mean of its divisors is an integer number (519857).

2^2159397 is an apocalyptic number.

It is an amenable number.

2159397 is a deficient number, since it is larger than the sum of its proper divisors (959745).

2159397 is a wasteful number, since it uses less digits than its factorization.

2159397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239939 (or 239936 counting only the distinct ones).

The product of its digits is 17010, while the sum is 36.

The square root of 2159397 is about 1469.4886865846. The cubic root of 2159397 is about 129.2540513554.

It can be divided in two parts, 2159 and 397, that added together give a triangular number (2556 = T₇₁).

The spelling of 2159397 in words is "two million, one hundred fifty-nine thousand, three hundred ninety-seven".