1285436944 has 80 divisors (see below), whose sum is σ = 2872584000. Its totient is φ = 551093760.

The previous prime is 1285436941. The next prime is 1285436947. The reversal of 1285436944 is 4496345821.

It is an interprime number because it is at equal distance from previous prime (1285436941) and next prime (1285436947).

It is a junction number, because it is equal to n+sod(n) for n = 1285436894 and 1285436903.

It is not an unprimeable number, because it can be changed into a prime (1285436941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898822 + ... + 900250.

It is an arithmetic number, because the mean of its divisors is an integer number (35907300).

Almost surely, 2^1285436944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285436944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1436292000).

1285436944 is an abundant number, since it is smaller than the sum of its proper divisors (1587147056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285436944 is a wasteful number, since it uses less digits than its factorization.

1285436944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1730 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 1285436944 is about 35852.9907260189. The cubic root of 1285436944 is about 1087.3021810264.

The spelling of 1285436944 in words is "one billion, two hundred eighty-five million, four hundred thirty-six thousand, nine hundred forty-four".