1285625440 has 48 divisors (see below), whose sum is σ = 3313411920. Its totient is φ = 467499520.

The previous prime is 1285625431. The next prime is 1285625489. The reversal of 1285625440 is 445265821.

It is a self number, because there is not a number n which added to its sum of digits gives 1285625440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363475 + ... + 366994.

It is an arithmetic number, because the mean of its divisors is an integer number (69029415).

Almost surely, 2^1285625440 is an apocalyptic number.

1285625440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285625440 is an abundant number, since it is smaller than the sum of its proper divisors (2027786480).

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

1285625440 is a wasteful number, since it uses less digits than its factorization.

1285625440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730495 (or 730487 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 1285625440 is about 35855.6193643340. The cubic root of 1285625440 is about 1087.3553256259.

The spelling of 1285625440 in words is "one billion, two hundred eighty-five million, six hundred twenty-five thousand, four hundred forty".