1002001995 has 96 divisors (see below), whose sum is σ = 1912135680. Its totient is φ = 502485120.

The previous prime is 1002001991. The next prime is 1002002009. The reversal of 1002001995 is 5991002001.

It is a happy number.

It is not a de Polignac number, because 1002001995 - 2² = 1002001991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1002001991) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1393246 + ... + 1393964.

It is an arithmetic number, because the mean of its divisors is an integer number (19918080).

Almost surely, 2^1002001995 is an apocalyptic number.

1002001995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1002001995 is a deficient number, since it is larger than the sum of its proper divisors (910133685).

1002001995 is an equidigital number, since it uses as much as digits as its factorization.

1002001995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 1002001995 is about 31654.4150948963. The cubic root of 1002001995 is about 1000.6668868298. Note that the first 3 decimals are identical.

Adding to 1002001995 its reverse (5991002001), we get a palindrome (6993003996).

The spelling of 1002001995 in words is "one billion, two million, one thousand, nine hundred ninety-five".