404928493 has 4 divisors (see below), whose sum is σ = 408937788. Its totient is φ = 400919200.

The previous prime is 404928473. The next prime is 404928521. The reversal of 404928493 is 394829404.

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 375313129 + 29615364 = 19373^2 + 5442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404928493 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 (404928473) 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, 2004496 + ... + 2004697.

It is an arithmetic number, because the mean of its divisors is an integer number (102234447).

Almost surely, 2^404928493 is an apocalyptic number.

It is an amenable number.

404928493 is a deficient number, since it is larger than the sum of its proper divisors (4009295).

404928493 is a wasteful number, since it uses less digits than its factorization.

404928493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009294.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 404928493 is about 20122.8351133731. The cubic root of 404928493 is about 739.8200761740.

The spelling of 404928493 in words is "four hundred four million, nine hundred twenty-eight thousand, four hundred ninety-three".