1285438544 has 40 divisors (see below), whose sum is σ = 2839896360. Its totient is φ = 558379008.

The previous prime is 1285438541. The next prime is 1285438577. The reversal of 1285438544 is 4458345821.

It can be written as a sum of positive squares in 4 ways, for example, as 59598400 + 1225840144 = 7720^2 + 35012^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1285438495 and 1285438504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285438541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178229 + ... + 185300.

It is an arithmetic number, because the mean of its divisors is an integer number (70997409).

Almost surely, 2^1285438544 is an apocalyptic number.

It is an amenable number.

1285438544 is an abundant number, since it is smaller than the sum of its proper divisors (1554457816).

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

1285438544 is a wasteful number, since it uses less digits than its factorization.

1285438544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363567 (or 363561 counting only the distinct ones).

The product of its digits is 614400, while the sum is 44.

The square root of 1285438544 is about 35853.0130393528. The cubic root of 1285438544 is about 1087.3026321526.

The spelling of 1285438544 in words is "one billion, two hundred eighty-five million, four hundred thirty-eight thousand, five hundred forty-four".