401216864 has 24 divisors (see below), whose sum is σ = 836361288. Its totient is φ = 188807680.

The previous prime is 401216843. The next prime is 401216873. The reversal of 401216864 is 468612104.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 401216864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368222 + ... + 369309.

It is an arithmetic number, because the mean of its divisors is an integer number (34848387).

Almost surely, 2^401216864 is an apocalyptic number.

It is an amenable number.

401216864 is an abundant number, since it is smaller than the sum of its proper divisors (435144424).

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

401216864 is a wasteful number, since it uses less digits than its factorization.

401216864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737558 (or 737550 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 401216864 is about 20030.3984982826. The cubic root of 401216864 is about 737.5527042293.

Adding to 401216864 its reverse (468612104), we get a palindrome (869828968).

The spelling of 401216864 in words is "four hundred one million, two hundred sixteen thousand, eight hundred sixty-four".