1285489494 has 16 divisors (see below), whose sum is σ = 2856643440. Its totient is φ = 428496480.

The previous prime is 1285489489. The next prime is 1285489511. The reversal of 1285489494 is 4949845821.

It is a happy number.

1285489494 is a `hidden beast` number, since 1 + 2 + 8 + 548 + 9 + 4 + 94 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 23805361 = 1285489494 / (1 + 2 + 8 + 5 + 4 + 8 + 9 + 4 + 9 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 1285489494.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11902627 + ... + 11902734.

It is an arithmetic number, because the mean of its divisors is an integer number (178540215).

Almost surely, 2^1285489494 is an apocalyptic number.

1285489494 is an abundant number, since it is smaller than the sum of its proper divisors (1571153946).

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

1285489494 is a wasteful number, since it uses less digits than its factorization.

1285489494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23805372 (or 23805366 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 1285489494 is about 35853.7235723153. The cubic root of 1285489494 is about 1087.3169975060.

The spelling of 1285489494 in words is "one billion, two hundred eighty-five million, four hundred eighty-nine thousand, four hundred ninety-four".