7439897 has 4 divisors (see below), whose sum is σ = 7877556. Its totient is φ = 7002240.

The previous prime is 7439867. The next prime is 7439909. The reversal of 7439897 is 7989347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7989347 = 331 ⋅24137.

It can be written as a sum of positive squares in 2 ways, for example, as 3984016 + 3455881 = 1996^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 7439897 - 2¹⁴ = 7423513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7439827) 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, 218804 + ... + 218837.

It is an arithmetic number, because the mean of its divisors is an integer number (1969389).

Almost surely, 2^7439897 is an apocalyptic number.

It is an amenable number.

7439897 is a deficient number, since it is larger than the sum of its proper divisors (437659).

7439897 is a wasteful number, since it uses less digits than its factorization.

7439897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437658.

The product of its digits is 381024, while the sum is 47.

The square root of 7439897 is about 2727.6174585158. The cubic root of 7439897 is about 195.2191006487.

The spelling of 7439897 in words is "seven million, four hundred thirty-nine thousand, eight hundred ninety-seven".