404020213 has 4 divisors (see below), whose sum is σ = 404062560. Its totient is φ = 403977868.

The previous prime is 404020193. The next prime is 404020223. The reversal of 404020213 is 312020404.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404020213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404020223) 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, 606 + ... + 28432.

It is an arithmetic number, because the mean of its divisors is an integer number (101015640).

Almost surely, 2^404020213 is an apocalyptic number.

It is an amenable number.

404020213 is a deficient number, since it is larger than the sum of its proper divisors (42347).

404020213 is a wasteful number, since it uses less digits than its factorization.

404020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42346.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 404020213 is about 20100.2540531208. The cubic root of 404020213 is about 739.2665077980.

Adding to 404020213 its reverse (312020404), we get a palindrome (716040617).

The spelling of 404020213 in words is "four hundred four million, twenty thousand, two hundred thirteen".