1286421873 has 8 divisors (see below), whose sum is σ = 1871159136. Its totient is φ = 779649600.

The previous prime is 1286421853. The next prime is 1286421881. The reversal of 1286421873 is 3781246821.

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

It is not a de Polignac number, because 1286421873 - 2¹⁸ = 1286159729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1286421803) 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 7 ways as a sum of consecutive naturals, for example, 19491208 + ... + 19491273.

It is an arithmetic number, because the mean of its divisors is an integer number (233894892).

Almost surely, 2^1286421873 is an apocalyptic number.

It is an amenable number.

1286421873 is a deficient number, since it is larger than the sum of its proper divisors (584737263).

1286421873 is a wasteful number, since it uses less digits than its factorization.

1286421873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38982495.

The product of its digits is 129024, while the sum is 42.

The square root of 1286421873 is about 35866.7237561504. The cubic root of 1286421873 is about 1087.5798147788.

The spelling of 1286421873 in words is "one billion, two hundred eighty-six million, four hundred twenty-one thousand, eight hundred seventy-three".