418661 has 4 divisors (see below), whose sum is σ = 420000. Its totient is φ = 417324.

The previous prime is 418657. The next prime is 418667. The reversal of 418661 is 166814.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 166814 = 2 ⋅83407.

It is a cyclic number.

It is not a de Polignac number, because 418661 - 2² = 418657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 418661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (418667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 918.

It is an arithmetic number, because the mean of its divisors is an integer number (105000).

2⁴¹⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

418661 is a deficient number, since it is larger than the sum of its proper divisors (1339).

418661 is an equidigital number, since it uses as much as digits as its factorization.

418661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338.

The product of its digits is 1152, while the sum is 26.

The square root of 418661 is about 647.0401842235. The cubic root of 418661 is about 74.8090550202.

The spelling of 418661 in words is "four hundred eighteen thousand, six hundred sixty-one".