1278498835 has 4 divisors (see below), whose sum is σ = 1534198608. Its totient is φ = 1022799064.

The previous prime is 1278498829. The next prime is 1278498839. The reversal of 1278498835 is 5388948721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5388948721 = 13 ⋅414534517.

It is a cyclic number.

It is not a de Polignac number, because 1278498835 - 2⁵ = 1278498803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278498839) 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, 127849879 + ... + 127849888.

It is an arithmetic number, because the mean of its divisors is an integer number (383549652).

Almost surely, 2^1278498835 is an apocalyptic number.

1278498835 is a deficient number, since it is larger than the sum of its proper divisors (255699773).

1278498835 is an equidigital number, since it uses as much as digits as its factorization.

1278498835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255699772.

The product of its digits is 3870720, while the sum is 55.

The square root of 1278498835 is about 35756.1020666403. The cubic root of 1278498835 is about 1085.3424234389.

The spelling of 1278498835 in words is "one billion, two hundred seventy-eight million, four hundred ninety-eight thousand, eight hundred thirty-five".