1285984394 has 8 divisors (see below), whose sum is σ = 1933162308. Its totient is φ = 641596960.

The previous prime is 1285984327. The next prime is 1285984457. The reversal of 1285984394 is 4934895821.

It can be written as a sum of positive squares in 2 ways, for example, as 1175461225 + 110523169 = 34285^2 + 10513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1285984394² = 3307511723223094472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696467 + ... + 698310.

Almost surely, 2^1285984394 is an apocalyptic number.

1285984394 is a deficient number, since it is larger than the sum of its proper divisors (647177914).

1285984394 is a wasteful number, since it uses less digits than its factorization.

1285984394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395240.

The product of its digits is 2488320, while the sum is 53.

The square root of 1285984394 is about 35860.6245623246. The cubic root of 1285984394 is about 1087.4565148244.

The spelling of 1285984394 in words is "one billion, two hundred eighty-five million, nine hundred eighty-four thousand, three hundred ninety-four".