1287249084 has 240 divisors, whose sum is σ = 3871752192. Its totient is φ = 369360000.

The previous prime is 1287249059. The next prime is 1287249101. The reversal of 1287249084 is 4809427821.

1287249084 is a `hidden beast` number, since 1 + 2 + 87 + 2 + 490 + 84 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6739429 + ... + 6739619.

Almost surely, 2^1287249084 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287249084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935876096).

1287249084 is an abundant number, since it is smaller than the sum of its proper divisors (2584503108).

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

1287249084 is a wasteful number, since it uses less digits than its factorization.

1287249084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1287249084 is about 35878.2536364300. The cubic root of 1287249084 is about 1087.8128811980.

The spelling of 1287249084 in words is "one billion, two hundred eighty-seven million, two hundred forty-nine thousand, eighty-four".