641807 has 4 divisors (see below), whose sum is σ = 644616. Its totient is φ = 639000.

The previous prime is 641803. The next prime is 641813. The reversal of 641807 is 708146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708146 = 2 ⋅354073.

It is a cyclic number.

It is not a de Polignac number, because 641807 - 2² = 641803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641807.

It is not an unprimeable number, because it can be changed into a prime (641803) 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, 1028 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (161154).

2⁶⁴¹⁸⁰⁷ is an apocalyptic number.

641807 is a deficient number, since it is larger than the sum of its proper divisors (2809).

641807 is a wasteful number, since it uses less digits than its factorization.

641807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 641807 is about 801.1285789435. The cubic root of 641807 is about 86.2584168780.

The spelling of 641807 in words is "six hundred forty-one thousand, eight hundred seven".