1285803990 has 32 divisors (see below), whose sum is σ = 3428811360. Its totient is φ = 342880992.

The previous prime is 1285803979. The next prime is 1285804031. The reversal of 1285803990 is 993085821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

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, 2380849 + ... + 2381388.

It is an arithmetic number, because the mean of its divisors is an integer number (107150355).

Almost surely, 2^1285803990 is an apocalyptic number.

1285803990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1285803990 is an abundant number, since it is smaller than the sum of its proper divisors (2143007370).

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

1285803990 is a wasteful number, since it uses less digits than its factorization.

1285803990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762253 (or 4762247 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1285803990 is about 35858.1091247154. The cubic root of 1285803990 is about 1087.4056612577.

The spelling of 1285803990 in words is "one billion, two hundred eighty-five million, eight hundred three thousand, nine hundred ninety".