1285109940 has 48 divisors (see below), whose sum is σ = 3649000320. Its totient is φ = 337868160.

The previous prime is 1285109939. The next prime is 1285109953. The reversal of 1285109940 is 499015821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146575 + ... + 155094.

It is an arithmetic number, because the mean of its divisors is an integer number (76020840).

Almost surely, 2^1285109940 is an apocalyptic number.

1285109940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285109940 is an abundant number, since it is smaller than the sum of its proper divisors (2363890380).

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

1285109940 is a wasteful number, since it uses less digits than its factorization.

1285109940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301752 (or 301750 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1285109940 is about 35848.4300911490. The cubic root of 1285109940 is about 1087.2099731282.

The spelling of 1285109940 in words is "one billion, two hundred eighty-five million, one hundred nine thousand, nine hundred forty".