404385816 has 64 divisors (see below), whose sum is σ = 1110470400. Its totient is φ = 122145408.

The previous prime is 404385811. The next prime is 404385847. The reversal of 404385816 is 618583404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404385811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8791 + ... + 29766.

It is an arithmetic number, because the mean of its divisors is an integer number (17351100).

Almost surely, 2^404385816 is an apocalyptic number.

404385816 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

404385816 is an abundant number, since it is smaller than the sum of its proper divisors (706084584).

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

404385816 is a wasteful number, since it uses less digits than its factorization.

404385816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38608 (or 38604 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 404385816 is about 20109.3464836628. The cubic root of 404385816 is about 739.4894311068.

The spelling of 404385816 in words is "four hundred four million, three hundred eighty-five thousand, eight hundred sixteen".