1287481392 has 100 divisors (see below), whose sum is σ = 3771555480. Its totient is φ = 423954432.

The previous prime is 1287481379. The next prime is 1287481399. The reversal of 1287481392 is 2931847821.

It is a happy number.

1287481392 is a `hidden beast` number, since 1 + 2 + 87 + 481 + 3 + 92 = 666.

It is not an unprimeable number, because it can be changed into a prime (1287481399) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 101584 + ... + 113552.

Almost surely, 2^1287481392 is an apocalyptic number.

1287481392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287481392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1885777740).

1287481392 is an abundant number, since it is smaller than the sum of its proper divisors (2484074088).

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

1287481392 is a wasteful number, since it uses less digits than its factorization.

1287481392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12072 (or 12057 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1287481392 is about 35881.4909389228. The cubic root of 1287481392 is about 1087.8783159399.

The spelling of 1287481392 in words is "one billion, two hundred eighty-seven million, four hundred eighty-one thousand, three hundred ninety-two".