404728540 has 12 divisors (see below), whose sum is σ = 849929976. Its totient is φ = 161891408.

The previous prime is 404728517. The next prime is 404728543. The reversal of 404728540 is 45827404.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 404728496 and 404728505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404728543) 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, 10118194 + ... + 10118233.

It is an arithmetic number, because the mean of its divisors is an integer number (70827498).

Almost surely, 2^404728540 is an apocalyptic number.

It is an amenable number.

404728540 is an abundant number, since it is smaller than the sum of its proper divisors (445201436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404728540 is a wasteful number, since it uses less digits than its factorization.

404728540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20236436 (or 20236434 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 404728540 is about 20117.8661890370. The cubic root of 404728540 is about 739.6982821602.

The spelling of 404728540 in words is "four hundred four million, seven hundred twenty-eight thousand, five hundred forty".