1278342975 has 48 divisors (see below), whose sum is σ = 2601277952. Its totient is φ = 539429760.

The previous prime is 1278342973. The next prime is 1278343021. The reversal of 1278342975 is 5792438721.

It is a happy number.

It is not a de Polignac number, because 1278342975 - 2¹ = 1278342973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278342973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86827 + ... + 100476.

Almost surely, 2^1278342975 is an apocalyptic number.

1278342975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278342975 is an abundant number, since it is smaller than the sum of its proper divisors (1322934977).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278342975 is a wasteful number, since it uses less digits than its factorization.

1278342975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187336 (or 187331 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The square root of 1278342975 is about 35753.9225120825. The cubic root of 1278342975 is about 1085.2983174557.

The spelling of 1278342975 in words is "one billion, two hundred seventy-eight million, three hundred forty-two thousand, nine hundred seventy-five".