1285940684 has 24 divisors (see below), whose sum is σ = 2573571840. Its totient is φ = 550755216.

The previous prime is 1285940657. The next prime is 1285940693. The reversal of 1285940684 is 4860495821.

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, 30707 + ... + 59285.

It is an arithmetic number, because the mean of its divisors is an integer number (107232160).

Almost surely, 2^1285940684 is an apocalyptic number.

1285940684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1285940684 is an abundant number, since it is smaller than the sum of its proper divisors (1287631156).

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

1285940684 is a wasteful number, since it uses less digits than its factorization.

1285940684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30197 (or 30195 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 47.

The square root of 1285940684 is about 35860.0151143303. The cubic root of 1285940684 is about 1087.4441939743. Note that the first 3 decimals are identical.

The spelling of 1285940684 in words is "one billion, two hundred eighty-five million, nine hundred forty thousand, six hundred eighty-four".