1642871 has 4 divisors (see below), whose sum is σ = 1655544. Its totient is φ = 1630200.

The previous prime is 1642859. The next prime is 1642903. The reversal of 1642871 is 1782461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1642871 - 2⁶ = 1642807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642801) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6140 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (413886).

2^1642871 is an apocalyptic number.

1642871 is a deficient number, since it is larger than the sum of its proper divisors (12673).

1642871 is a wasteful number, since it uses less digits than its factorization.

1642871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12672.

The product of its digits is 2688, while the sum is 29.

The square root of 1642871 is about 1281.7452945106. The cubic root of 1642871 is about 117.9961456177.

The spelling of 1642871 in words is "one million, six hundred forty-two thousand, eight hundred seventy-one".