400217796 has 72 divisors (see below), whose sum is σ = 1105872768. Its totient is φ = 121032000.

The previous prime is 400217773. The next prime is 400217801. The reversal of 400217796 is 697712004.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 400217796.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324501 + ... + 325731.

It is an arithmetic number, because the mean of its divisors is an integer number (15359344).

Almost surely, 2^400217796 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 400217796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552936384).

400217796 is an abundant number, since it is smaller than the sum of its proper divisors (705654972).

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

400217796 is a wasteful number, since it uses less digits than its factorization.

400217796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073 (or 2068 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 400217796 is about 20005.4441590283. Note that the first 3 decimals coincide. The cubic root of 400217796 is about 736.9400033516.

The spelling of 400217796 in words is "four hundred million, two hundred seventeen thousand, seven hundred ninety-six".