2139597 has 6 divisors (see below), whose sum is σ = 3090542. Its totient is φ = 1426392.

The previous prime is 2139583. The next prime is 2139607. The reversal of 2139597 is 7959312.

It can be written as a sum of positive squares in only one way, i.e., 1313316 + 826281 = 1146^2 + 909^2 .

It is not a de Polignac number, because 2139597 - 2¹¹ = 2137549 is a prime.

It is an Ulam 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 (2139497) 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, 118858 + ... + 118875.

2^2139597 is an apocalyptic number.

It is an amenable number.

2139597 is a deficient number, since it is larger than the sum of its proper divisors (950945).

2139597 is a wasteful number, since it uses less digits than its factorization.

2139597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237739 (or 237736 counting only the distinct ones).

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

The square root of 2139597 is about 1462.7361347830. The cubic root of 2139597 is about 128.8577845022.

The spelling of 2139597 in words is "two million, one hundred thirty-nine thousand, five hundred ninety-seven".