1257792378 has 32 divisors (see below), whose sum is σ = 2546384256. Its totient is φ = 414156288.

The previous prime is 1257792377. The next prime is 1257792391. The reversal of 1257792378 is 8732977521.

It is a self number, because there is not a number n which added to its sum of digits gives 1257792378.

It is not an unprimeable number, because it can be changed into a prime (1257792373) 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 15 ways as a sum of consecutive naturals, for example, 209251 + ... + 215177.

It is an arithmetic number, because the mean of its divisors is an integer number (79574508).

Almost surely, 2^1257792378 is an apocalyptic number.

1257792378 is an abundant number, since it is smaller than the sum of its proper divisors (1288591878).

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

1257792378 is a wasteful number, since it uses less digits than its factorization.

1257792378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6358.

The product of its digits is 1481760, while the sum is 51.

The square root of 1257792378 is about 35465.3687137185. The cubic root of 1257792378 is about 1079.4511322864.

The spelling of 1257792378 in words is "one billion, two hundred fifty-seven million, seven hundred ninety-two thousand, three hundred seventy-eight".