401997216 has 24 divisors (see below), whose sum is σ = 1055242944. Its totient is φ = 133999040.

The previous prime is 401997187. The next prime is 401997227. The reversal of 401997216 is 612799104.

It is a tau number, because it is divible by the number of its divisors (24).

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 3 ways as a sum of consecutive naturals, for example, 2093640 + ... + 2093831.

It is an arithmetic number, because the mean of its divisors is an integer number (43968456).

Almost surely, 2^401997216 is an apocalyptic number.

It is an amenable number.

401997216 is an abundant number, since it is smaller than the sum of its proper divisors (653245728).

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

401997216 is a wasteful number, since it uses less digits than its factorization.

401997216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187484 (or 4187476 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 401997216 is about 20049.8682289934. The cubic root of 401997216 is about 738.0305654896.

The spelling of 401997216 in words is "four hundred one million, nine hundred ninety-seven thousand, two hundred sixteen".