1239273897 has 4 divisors (see below), whose sum is σ = 1652365200. Its totient is φ = 826182596.

The previous prime is 1239273881. The next prime is 1239273953. The reversal of 1239273897 is 7983729321.

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: 7983729321 = 3 ⋅2661243107.

It is a cyclic number.

It is not a de Polignac number, because 1239273897 - 2⁴ = 1239273881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1239273197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206545647 + ... + 206545652.

It is an arithmetic number, because the mean of its divisors is an integer number (413091300).

Almost surely, 2^1239273897 is an apocalyptic number.

It is an amenable number.

1239273897 is a deficient number, since it is larger than the sum of its proper divisors (413091303).

1239273897 is an equidigital number, since it uses as much as digits as its factorization.

1239273897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413091302.

The product of its digits is 1143072, while the sum is 51.

The square root of 1239273897 is about 35203.3222437883. The cubic root of 1239273897 is about 1074.1273312893.

The spelling of 1239273897 in words is "one billion, two hundred thirty-nine million, two hundred seventy-three thousand, eight hundred ninety-seven".