400020366 has 16 divisors (see below), whose sum is σ = 800236800. Its totient is φ = 133307448.

The previous prime is 400020359. The next prime is 400020367. The reversal of 400020366 is 663020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400020367) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43305 + ... + 51723.

It is an arithmetic number, because the mean of its divisors is an integer number (50014800).

Almost surely, 2^400020366 is an apocalyptic number.

400020366 is an abundant number, since it is smaller than the sum of its proper divisors (400216434).

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

400020366 is a wasteful number, since it uses less digits than its factorization.

400020366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16343.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 400020366 is about 20000.5091435193. The cubic root of 400020366 is about 736.8188043468.

The spelling of 400020366 in words is "four hundred million, twenty thousand, three hundred sixty-six".