1279203897 has 4 divisors (see below), whose sum is σ = 1705605200. Its totient is φ = 852802596.

The previous prime is 1279203883. The next prime is 1279203931. The reversal of 1279203897 is 7983029721.

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.

It is not a de Polignac number, because 1279203897 - 2¹⁸ = 1278941753 is a prime.

It is a super-2 number, since 2×1279203897² = 3272725220199973218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279253897) 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, 213200647 + ... + 213200652.

It is an arithmetic number, because the mean of its divisors is an integer number (426401300).

Almost surely, 2^1279203897 is an apocalyptic number.

It is an amenable number.

1279203897 is a deficient number, since it is larger than the sum of its proper divisors (426401303).

1279203897 is an equidigital number, since it uses as much as digits as its factorization.

1279203897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426401302.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 1279203897 is about 35765.9600318515. The cubic root of 1279203897 is about 1085.5419003704.

The spelling of 1279203897 in words is "one billion, two hundred seventy-nine million, two hundred three thousand, eight hundred ninety-seven".