1278426634 has 8 divisors (see below), whose sum is σ = 1926728928. Its totient is φ = 636183660.

The previous prime is 1278426631. The next prime is 1278426661. The reversal of 1278426634 is 4366248721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1278426631) 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, 1514302 + ... + 1515145.

It is an arithmetic number, because the mean of its divisors is an integer number (240841116).

Almost surely, 2^1278426634 is an apocalyptic number.

1278426634 is a deficient number, since it is larger than the sum of its proper divisors (648302294).

1278426634 is a wasteful number, since it uses less digits than its factorization.

1278426634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029660.

The product of its digits is 387072, while the sum is 43.

The square root of 1278426634 is about 35755.0924205210. The cubic root of 1278426634 is about 1085.3219921119.

The spelling of 1278426634 in words is "one billion, two hundred seventy-eight million, four hundred twenty-six thousand, six hundred thirty-four".