641409 has 8 divisors (see below), whose sum is σ = 873600. Its totient is φ = 418416.

The previous prime is 641387. The next prime is 641411. The reversal of 641409 is 904146.

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

It is not a de Polignac number, because 641409 - 2¹¹ = 639361 is a prime.

It is a super-2 number, since 2×641409² = 822811010562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134 + ... + 2415.

It is an arithmetic number, because the mean of its divisors is an integer number (109200).

2⁶⁴¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

641409 is a deficient number, since it is larger than the sum of its proper divisors (232191).

641409 is a wasteful number, since it uses less digits than its factorization.

641409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4599.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 641409 is about 800.8801408451. The cubic root of 641409 is about 86.2405828828.

The spelling of 641409 in words is "six hundred forty-one thousand, four hundred nine".