1285944947 has 16 divisors (see below), whose sum is σ = 1557408000. Its totient is φ = 1037201760.

The previous prime is 1285944917. The next prime is 1285944949. The reversal of 1285944947 is 7494495821.

It is not a de Polignac number, because 1285944947 - 2¹⁴ = 1285928563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285944949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12629 + ... + 52262.

It is an arithmetic number, because the mean of its divisors is an integer number (97338000).

Almost surely, 2^1285944947 is an apocalyptic number.

1285944947 is a deficient number, since it is larger than the sum of its proper divisors (271463053).

1285944947 is a wasteful number, since it uses less digits than its factorization.

1285944947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65066.

The product of its digits is 2903040, while the sum is 53.

The square root of 1285944947 is about 35860.0745537429. The cubic root of 1285944947 is about 1087.4453956289.

The spelling of 1285944947 in words is "one billion, two hundred eighty-five million, nine hundred forty-four thousand, nine hundred forty-seven".