1287087697 has 8 divisors (see below), whose sum is σ = 1557484416. Its totient is φ = 1038322752.

The previous prime is 1287087677. The next prime is 1287087709. The reversal of 1287087697 is 7967807821.

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 1287087697 - 2¹⁹ = 1286563409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287087677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5407813 + ... + 5408050.

It is an arithmetic number, because the mean of its divisors is an integer number (194685552).

Almost surely, 2^1287087697 is an apocalyptic number.

1287087697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1287087697 is a deficient number, since it is larger than the sum of its proper divisors (270396719).

1287087697 is a wasteful number, since it uses less digits than its factorization.

1287087697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10815887.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The square root of 1287087697 is about 35876.0044737426. The cubic root of 1287087697 is about 1087.7674183069.

The spelling of 1287087697 in words is "one billion, two hundred eighty-seven million, eighty-seven thousand, six hundred ninety-seven".