404209481 has 4 divisors (see below), whose sum is σ = 435302532. Its totient is φ = 373116432.

The previous prime is 404209469. The next prime is 404209489. The reversal of 404209481 is 184902404.

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 102839881 + 301369600 = 10141^2 + 17360^2 .

It is not a de Polignac number, because 404209481 - 2¹⁸ = 403947337 is a prime.

It is a super-2 number, since 2×404209481² = 326770609060578722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404209489) 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, 15546506 + ... + 15546531.

It is an arithmetic number, because the mean of its divisors is an integer number (108825633).

Almost surely, 2^404209481 is an apocalyptic number.

It is an amenable number.

404209481 is a deficient number, since it is larger than the sum of its proper divisors (31093051).

404209481 is a wasteful number, since it uses less digits than its factorization.

404209481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31093050.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 404209481 is about 20104.9616015550. The cubic root of 404209481 is about 739.3819291273.

The spelling of 404209481 in words is "four hundred four million, two hundred nine thousand, four hundred eighty-one".