404775397 has 4 divisors (see below), whose sum is σ = 435911980. Its totient is φ = 373638816.

The previous prime is 404775361. The next prime is 404775409. The reversal of 404775397 is 793577404.

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 279357796 + 125417601 = 16714^2 + 11199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404775397 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 (404775307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15568272 + ... + 15568297.

It is an arithmetic number, because the mean of its divisors is an integer number (108977995).

Almost surely, 2^404775397 is an apocalyptic number.

It is an amenable number.

404775397 is a deficient number, since it is larger than the sum of its proper divisors (31136583).

404775397 is a wasteful number, since it uses less digits than its factorization.

404775397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31136582.

The product of its (nonzero) digits is 740880, while the sum is 46.

The square root of 404775397 is about 20119.0307172090. The cubic root of 404775397 is about 739.7268269760.

The spelling of 404775397 in words is "four hundred four million, seven hundred seventy-five thousand, three hundred ninety-seven".