404280769 has 4 divisors (see below), whose sum is σ = 404321220. Its totient is φ = 404240320.

The previous prime is 404280763. The next prime is 404280823. The reversal of 404280769 is 967082404.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 101103025 + 303177744 = 10055^2 + 17412^2 .

It is a cyclic number.

It is not a de Polignac number, because 404280769 - 2¹³ = 404272577 is a prime.

It is a super-2 number, since 2×404280769² = 326885880366462722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404280763) 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, 6837 + ... + 29245.

It is an arithmetic number, because the mean of its divisors is an integer number (101080305).

Almost surely, 2^404280769 is an apocalyptic number.

It is an amenable number.

404280769 is a deficient number, since it is larger than the sum of its proper divisors (40451).

404280769 is a wasteful number, since it uses less digits than its factorization.

404280769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40450.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 404280769 is about 20106.7344190945. The cubic root of 404280769 is about 739.4253933565.

The spelling of 404280769 in words is "four hundred four million, two hundred eighty thousand, seven hundred sixty-nine".