1021995 has 24 divisors (see below), whose sum is σ = 1908816. Its totient is φ = 502848.

The previous prime is 1021973. The next prime is 1022011. The reversal of 1021995 is 5991201.

It is a happy number.

It is not a de Polignac number, because 1021995 - 2⁵ = 1021963 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (79534).

2^1021995 is an apocalyptic number.

1021995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1021995 is a deficient number, since it is larger than the sum of its proper divisors (886821).

1021995 is a wasteful number, since it uses less digits than its factorization.

1021995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771 (or 1768 counting only the distinct ones).

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

The square root of 1021995 is about 1010.9376835394. The cubic root of 1021995 is about 100.7278560688.

It can be divided in two parts, 1021 and 995, that added together give a triangular number (2016 = T₆₃).

The spelling of 1021995 in words is "one million, twenty-one thousand, nine hundred ninety-five".