1287493326 has 96 divisors (see below), whose sum is σ = 3338357760. Its totient is φ = 366735600.

The previous prime is 1287493321. The next prime is 1287493343. The reversal of 1287493326 is 6233947821.

1287493326 is a `hidden beast` number, since 1 + 287 + 49 + 3 + 326 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287493321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1298691 + ... + 1299681.

It is an arithmetic number, because the mean of its divisors is an integer number (34774560).

Almost surely, 2^1287493326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287493326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669178880).

1287493326 is an abundant number, since it is smaller than the sum of its proper divisors (2050864434).

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

1287493326 is a wasteful number, since it uses less digits than its factorization.

1287493326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1494 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1287493326 is about 35881.6572359750. The cubic root of 1287493326 is about 1087.8816772052.

The spelling of 1287493326 in words is "one billion, two hundred eighty-seven million, four hundred ninety-three thousand, three hundred twenty-six".