1278245803 has 4 divisors (see below), whose sum is σ = 1278903600. Its totient is φ = 1277588008.

The previous prime is 1278245791. The next prime is 1278245869. The reversal of 1278245803 is 3085428721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278245803 is a prime.

It is a super-2 number, since 2×1278245803² = 3267824665774229618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278245893) 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, 325975 + ... + 329872.

It is an arithmetic number, because the mean of its divisors is an integer number (319725900).

Almost surely, 2^1278245803 is an apocalyptic number.

1278245803 is a deficient number, since it is larger than the sum of its proper divisors (657797).

1278245803 is an equidigital number, since it uses as much as digits as its factorization.

1278245803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657796.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 1278245803 is about 35752.5635864059. The cubic root of 1278245803 is about 1085.2708174596.

It can be divided in two parts, 12782 and 45803, that added together give a palindrome (58585).

The spelling of 1278245803 in words is "one billion, two hundred seventy-eight million, two hundred forty-five thousand, eight hundred three".