404355421 has 4 divisors (see below), whose sum is σ = 428141052. Its totient is φ = 380569792.

The previous prime is 404355409. The next prime is 404355431. The reversal of 404355421 is 124553404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 379704196 + 24651225 = 19486^2 + 4965^2 .

It is a cyclic number.

It is not a de Polignac number, because 404355421 - 2⁵ = 404355389 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 404355421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404355431) 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, 11892790 + ... + 11892823.

It is an arithmetic number, because the mean of its divisors is an integer number (107035263).

Almost surely, 2^404355421 is an apocalyptic number.

It is an amenable number.

404355421 is a deficient number, since it is larger than the sum of its proper divisors (23785631).

404355421 is a wasteful number, since it uses less digits than its factorization.

404355421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23785630.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 404355421 is about 20108.5907263537. The cubic root of 404355421 is about 739.4709031371.

The spelling of 404355421 in words is "four hundred four million, three hundred fifty-five thousand, four hundred twenty-one".