1285297146 has 80 divisors (see below), whose sum is σ = 3358766400. Its totient is φ = 367211880.

The previous prime is 1285297129. The next prime is 1285297177. The reversal of 1285297146 is 6417925821.

1285297146 is a `hidden beast` number, since 12 + 8 + 529 + 71 + 46 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44001 + ... + 67131.

It is an arithmetic number, because the mean of its divisors is an integer number (41984580).

Almost surely, 2^1285297146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285297146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1679383200).

1285297146 is an abundant number, since it is smaller than the sum of its proper divisors (2073469254).

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

1285297146 is an equidigital number, since it uses as much as digits as its factorization.

1285297146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23166 (or 23143 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1285297146 is about 35851.0410727499. The cubic root of 1285297146 is about 1087.2627629951.

The spelling of 1285297146 in words is "one billion, two hundred eighty-five million, two hundred ninety-seven thousand, one hundred forty-six".