1287397481 has 8 divisors (see below), whose sum is σ = 1329360384. Its totient is φ = 1245461760.

The previous prime is 1287397453. The next prime is 1287397513. The reversal of 1287397481 is 1847937821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1287397481 - 2¹⁴ = 1287381097 is a prime.

It is a super-2 number, since 2×1287397481² = 3314784548170290722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287397381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140420 + ... + 149306.

It is an arithmetic number, because the mean of its divisors is an integer number (166170048).

Almost surely, 2^1287397481 is an apocalyptic number.

It is an amenable number.

1287397481 is a deficient number, since it is larger than the sum of its proper divisors (41962903).

1287397481 is an equidigital number, since it uses as much as digits as its factorization.

1287397481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13591.

The product of its digits is 677376, while the sum is 50.

The square root of 1287397481 is about 35880.3216401414. The cubic root of 1287397481 is about 1087.8546814389.

The spelling of 1287397481 in words is "one billion, two hundred eighty-seven million, three hundred ninety-seven thousand, four hundred eighty-one".