1278672433 has 4 divisors (see below), whose sum is σ = 1294858240. Its totient is φ = 1262486628.

The previous prime is 1278672413. The next prime is 1278672443. The reversal of 1278672433 is 3342768721.

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: 3342768721 = 467 ⋅7157963.

It is a cyclic number.

It is not a de Polignac number, because 1278672433 - 2⁹ = 1278671921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278672433.

It is not an unprimeable number, because it can be changed into a prime (1278672413) 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, 8092785 + ... + 8092942.

It is an arithmetic number, because the mean of its divisors is an integer number (323714560).

Almost surely, 2^1278672433 is an apocalyptic number.

It is an amenable number.

1278672433 is a deficient number, since it is larger than the sum of its proper divisors (16185807).

1278672433 is an equidigital number, since it uses as much as digits as its factorization.

1278672433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16185806.

The product of its digits is 338688, while the sum is 43.

The square root of 1278672433 is about 35758.5295139495. The cubic root of 1278672433 is about 1085.3915447839.

The spelling of 1278672433 in words is "one billion, two hundred seventy-eight million, six hundred seventy-two thousand, four hundred thirty-three".