1285988893 has 8 divisors (see below), whose sum is σ = 1470020288. Its totient is φ = 1102037184.

The previous prime is 1285988881. The next prime is 1285988947. The reversal of 1285988893 is 3988895821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285988893 is a prime.

It is a super-5 number, since 5×1285988893⁵ (a number of 47 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285988833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20005 + ... + 54517.

It is an arithmetic number, because the mean of its divisors is an integer number (183752536).

Almost surely, 2^1285988893 is an apocalyptic number.

It is an amenable number.

1285988893 is a deficient number, since it is larger than the sum of its proper divisors (184031395).

1285988893 is an equidigital number, since it uses as much as digits as its factorization.

1285988893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39843.

The product of its digits is 9953280, while the sum is 61.

The square root of 1285988893 is about 35860.6872912386. The cubic root of 1285988893 is about 1087.4577829738.

The spelling of 1285988893 in words is "one billion, two hundred eighty-five million, nine hundred eighty-eight thousand, eight hundred ninety-three".