1001386885 has 4 divisors (see below), whose sum is σ = 1201664268. Its totient is φ = 801109504.

The previous prime is 1001386877. The next prime is 1001386889. The reversal of 1001386885 is 5886831001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5886831001 = 11903 ⋅494567.

It can be written as a sum of positive squares in 2 ways, for example, as 616677889 + 384708996 = 24833^2 + 19614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001386885 - 2³ = 1001386877 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001386889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100138684 + ... + 100138693.

It is an arithmetic number, because the mean of its divisors is an integer number (300416067).

Almost surely, 2^1001386885 is an apocalyptic number.

It is an amenable number.

1001386885 is a deficient number, since it is larger than the sum of its proper divisors (200277383).

1001386885 is an equidigital number, since it uses as much as digits as its factorization.

1001386885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200277382.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1001386885 is about 31644.6975811114. The cubic root of 1001386885 is about 1000.4620814478.

The spelling of 1001386885 in words is "one billion, one million, three hundred eighty-six thousand, eight hundred eighty-five".