1285420267 has 4 divisors (see below), whose sum is σ = 1293933136. Its totient is φ = 1276907400.

The previous prime is 1285420261. The next prime is 1285420277. The reversal of 1285420267 is 7620245821.

It is a happy number.

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 1285420267 - 2¹⁹ = 1284895979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285420261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256208 + ... + 4256509.

It is an arithmetic number, because the mean of its divisors is an integer number (323483284).

Almost surely, 2^1285420267 is an apocalyptic number.

1285420267 is a deficient number, since it is larger than the sum of its proper divisors (8512869).

1285420267 is an equidigital number, since it uses as much as digits as its factorization.

1285420267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8512868.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 1285420267 is about 35852.7581505245. The cubic root of 1285420267 is about 1087.2974788596.

The spelling of 1285420267 in words is "one billion, two hundred eighty-five million, four hundred twenty thousand, two hundred sixty-seven".