418921 has 2 divisors, whose sum is σ = 418922. Its totient is φ = 418920.

The previous prime is 418909. The next prime is 418927. The reversal of 418921 is 129814.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250000 + 168921 = 500^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 418921 - 2⁵ = 418889 is a prime.

It is an alternating number because its digits alternate between even and odd.

418921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (418927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209460 + 209461.

It is an arithmetic number, because the mean of its divisors is an integer number (209461).

2⁴¹⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

418921 is a deficient number, since it is larger than the sum of its proper divisors (1).

418921 is an equidigital number, since it uses as much as digits as its factorization.

418921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 418921 is about 647.2410679183. The cubic root of 418921 is about 74.8245379760.

The spelling of 418921 in words is "four hundred eighteen thousand, nine hundred twenty-one".