1285697408 has 32 divisors (see below), whose sum is σ = 2615859360. Its totient is φ = 629168128.

The previous prime is 1285697381. The next prime is 1285697411. The reversal of 1285697408 is 8047965821.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100841 + ... + 112872.

It is an arithmetic number, because the mean of its divisors is an integer number (81745605).

Almost surely, 2^1285697408 is an apocalyptic number.

It is an amenable number.

1285697408 is an abundant number, since it is smaller than the sum of its proper divisors (1330161952).

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

1285697408 is an equidigital number, since it uses as much as digits as its factorization.

1285697408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213774 (or 213762 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 1285697408 is about 35856.6229307781. The cubic root of 1285697408 is about 1087.3756149277.

The spelling of 1285697408 in words is "one billion, two hundred eighty-five million, six hundred ninety-seven thousand, four hundred eight".