641405 has 8 divisors (see below), whose sum is σ = 775392. Its totient is φ = 509328.

The previous prime is 641387. The next prime is 641411. The reversal of 641405 is 504146.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641405 - 2¹² = 637309 is a prime.

It is a super-2 number, since 2×641405² = 822800748050, which contains 22 as substring.

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 641405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422 + ... + 1208.

It is an arithmetic number, because the mean of its divisors is an integer number (96924).

2⁶⁴¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

641405 is a deficient number, since it is larger than the sum of its proper divisors (133987).

641405 is a wasteful number, since it uses less digits than its factorization.

641405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 641405 is about 800.8776435886. The cubic root of 641405 is about 86.2404036092.

The spelling of 641405 in words is "six hundred forty-one thousand, four hundred five".