1287286421 has 4 divisors (see below), whose sum is σ = 1287616512. Its totient is φ = 1286956332.

The previous prime is 1287286411. The next prime is 1287286433. The reversal of 1287286421 is 1246827821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1287286421 - 2¹⁴ = 1287270037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287286411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159125 + ... + 167018.

It is an arithmetic number, because the mean of its divisors is an integer number (321904128).

Almost surely, 2^1287286421 is an apocalyptic number.

It is an amenable number.

1287286421 is a deficient number, since it is larger than the sum of its proper divisors (330091).

1287286421 is an equidigital number, since it uses as much as digits as its factorization.

1287286421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330090.

The product of its digits is 86016, while the sum is 41.

The square root of 1287286421 is about 35878.7739617730. The cubic root of 1287286421 is about 1087.8233985298.

The spelling of 1287286421 in words is "one billion, two hundred eighty-seven million, two hundred eighty-six thousand, four hundred twenty-one".