1421397287 has 4 divisors (see below), whose sum is σ = 1429908816. Its totient is φ = 1412885760.

The previous prime is 1421397283. The next prime is 1421397323. The reversal of 1421397287 is 7827931241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1421397287 - 2² = 1421397283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421397283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4255514 + ... + 4255847.

It is an arithmetic number, because the mean of its divisors is an integer number (357477204).

Almost surely, 2^1421397287 is an apocalyptic number.

1421397287 is a deficient number, since it is larger than the sum of its proper divisors (8511529).

1421397287 is an equidigital number, since it uses as much as digits as its factorization.

1421397287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8511528.

The product of its digits is 169344, while the sum is 44.

The square root of 1421397287 is about 37701.4228776581. The cubic root of 1421397287 is about 1124.3594146062.

The spelling of 1421397287 in words is "one billion, four hundred twenty-one million, three hundred ninety-seven thousand, two hundred eighty-seven".