1642005 has 16 divisors (see below), whose sum is σ = 2919360. Its totient is φ = 875664.

The previous prime is 1641971. The next prime is 1642021. The reversal of 1642005 is 5002461.

It is a happy number.

It is not a de Polignac number, because 1642005 - 2¹⁷ = 1510933 is a prime.

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, 5947 + ... + 6216.

It is an arithmetic number, because the mean of its divisors is an integer number (182460).

2^1642005 is an apocalyptic number.

1642005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1642005 is a deficient number, since it is larger than the sum of its proper divisors (1277355).

1642005 is a wasteful number, since it uses less digits than its factorization.

1642005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12177 (or 12171 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1642005 is about 1281.4074293526. The cubic root of 1642005 is about 117.9754090287.

Adding to 1642005 its reverse (5002461), we get a palindrome (6644466).

The spelling of 1642005 in words is "one million, six hundred forty-two thousand, five".