1287284894 has 36 divisors (see below), whose sum is σ = 2269464696. Its totient is φ = 536447016.

The previous prime is 1287284881. The next prime is 1287284909. The reversal of 1287284894 is 4984827821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5772467 + ... + 5772689.

It is an arithmetic number, because the mean of its divisors is an integer number (63040686).

Almost surely, 2^1287284894 is an apocalyptic number.

1287284894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1287284894 is a deficient number, since it is larger than the sum of its proper divisors (982179802).

1287284894 is an frugal number, since it uses more digits than its factorization.

1287284894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 275 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 53.

The square root of 1287284894 is about 35878.7526817753. The cubic root of 1287284894 is about 1087.8229683983.

The spelling of 1287284894 in words is "one billion, two hundred eighty-seven million, two hundred eighty-four thousand, eight hundred ninety-four".