1295735978 has 16 divisors (see below), whose sum is σ = 1955971584. Its totient is φ = 643753440.

The previous prime is 1295735977. The next prime is 1295736007. The reversal of 1295735978 is 8795375921.

It is not an unprimeable number, because it can be changed into a prime (1295735977) 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 7 ways as a sum of consecutive naturals, for example, 543926 + ... + 546302.

It is an arithmetic number, because the mean of its divisors is an integer number (122248224).

Almost surely, 2^1295735978 is an apocalyptic number.

1295735978 is a deficient number, since it is larger than the sum of its proper divisors (660235606).

1295735978 is a wasteful number, since it uses less digits than its factorization.

1295735978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997.

The product of its digits is 4762800, while the sum is 56.

The square root of 1295735978 is about 35996.3328409992. The cubic root of 1295735978 is about 1090.1983136629.

The spelling of 1295735978 in words is "one billion, two hundred ninety-five million, seven hundred thirty-five thousand, nine hundred seventy-eight".