1239897 has 4 divisors (see below), whose sum is σ = 1653200. Its totient is φ = 826596.

The previous prime is 1239893. The next prime is 1239899. The reversal of 1239897 is 7989321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7989321 = 3 ⋅2663107.

It is not a de Polignac number, because 1239897 - 2² = 1239893 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1239893) 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, 206647 + ... + 206652.

It is an arithmetic number, because the mean of its divisors is an integer number (413300).

2^1239897 is an apocalyptic number.

It is an amenable number.

1239897 is a deficient number, since it is larger than the sum of its proper divisors (413303).

1239897 is an equidigital number, since it uses as much as digits as its factorization.

1239897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413302.

The product of its digits is 27216, while the sum is 39.

The square root of 1239897 is about 1113.5066232403. The cubic root of 1239897 is about 107.4307323736.

The spelling of 1239897 in words is "one million, two hundred thirty-nine thousand, eight hundred ninety-seven".