1286421697 has 4 divisors (see below), whose sum is σ = 1403369136. Its totient is φ = 1169474260.

The previous prime is 1286421691. The next prime is 1286421707. The reversal of 1286421697 is 7961246821.

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 a de Polignac number, because none of the positive numbers 2^k-1286421697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286421691) 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, 58473703 + ... + 58473724.

It is an arithmetic number, because the mean of its divisors is an integer number (350842284).

Almost surely, 2^1286421697 is an apocalyptic number.

It is an amenable number.

1286421697 is a deficient number, since it is larger than the sum of its proper divisors (116947439).

1286421697 is a wasteful number, since it uses less digits than its factorization.

1286421697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116947438.

The product of its digits is 290304, while the sum is 46.

The square root of 1286421697 is about 35866.7213026226. The cubic root of 1286421697 is about 1087.5797651803.

The spelling of 1286421697 in words is "one billion, two hundred eighty-six million, four hundred twenty-one thousand, six hundred ninety-seven".