404693820 has 60 divisors (see below), whose sum is σ = 1269544584. Its totient is φ = 107917920.

The previous prime is 404693819. The next prime is 404693837. The reversal of 404693820 is 28396404.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 123286 + ... + 126525.

Almost surely, 2^404693820 is an apocalyptic number.

It is an amenable number.

404693820 is an abundant number, since it is smaller than the sum of its proper divisors (864850764).

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

404693820 is a wasteful number, since it uses less digits than its factorization.

404693820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249832 (or 249821 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 404693820 is about 20117.0032559524. The cubic root of 404693820 is about 739.6771296623.

The spelling of 404693820 in words is "four hundred four million, six hundred ninety-three thousand, eight hundred twenty".