400017020 has 48 divisors (see below), whose sum is σ = 906540768. Its totient is φ = 147390720.

The previous prime is 400017019. The next prime is 400017031. The reversal of 400017020 is 20710004.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 400016986 and 400017004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151310 + ... + 153930.

It is an arithmetic number, because the mean of its divisors is an integer number (18886266).

Almost surely, 2^400017020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400017020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453270384).

400017020 is an abundant number, since it is smaller than the sum of its proper divisors (506523748).

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

400017020 is a wasteful number, since it uses less digits than its factorization.

400017020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3230 (or 3228 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 400017020 is about 20000.4254954738. The cubic root of 400017020 is about 736.8167499492.

Adding to 400017020 its reverse (20710004), we get a palindrome (420727024).

The spelling of 400017020 in words is "four hundred million, seventeen thousand, twenty".