1285420269 has 24 divisors (see below), whose sum is σ = 2080742848. Its totient is φ = 691315200.

The previous prime is 1285420261. The next prime is 1285420277. The reversal of 1285420269 is 9620245821.

It is an interprime number because it is at equal distance from previous prime (1285420261) and next prime (1285420277).

It is not a de Polignac number, because 1285420269 - 2³ = 1285420261 is a prime.

It is a super-2 number, since 2×1285420269² = 3304610535912064722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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 (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 23 ways as a sum of consecutive naturals, for example, 99832 + ... + 111969.

Almost surely, 2^1285420269 is an apocalyptic number.

It is an amenable number.

1285420269 is a deficient number, since it is larger than the sum of its proper divisors (795322579).

1285420269 is a wasteful number, since it uses less digits than its factorization.

1285420269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211845 (or 211828 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1285420269 is about 35852.7581784163. The cubic root of 1285420269 is about 1087.2974794235.

The spelling of 1285420269 in words is "one billion, two hundred eighty-five million, four hundred twenty thousand, two hundred sixty-nine".