1285449520 has 40 divisors (see below), whose sum is σ = 3039336720. Its totient is φ = 505463040.

The previous prime is 1285449499. The next prime is 1285449619. The reversal of 1285449520 is 259445821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131451 + ... + 140890.

It is an arithmetic number, because the mean of its divisors is an integer number (75983418).

Almost surely, 2^1285449520 is an apocalyptic number.

1285449520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285449520 is an abundant number, since it is smaller than the sum of its proper divisors (1753887200).

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

1285449520 is a wasteful number, since it uses less digits than its factorization.

1285449520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272413 (or 272407 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 1285449520 is about 35853.1661084485. The cubic root of 1285449520 is about 1087.3057268681.

The spelling of 1285449520 in words is "one billion, two hundred eighty-five million, four hundred forty-nine thousand, five hundred twenty".