401997568 has 108 divisors (see below), whose sum is σ = 948375120. Its totient is φ = 169537536.

The previous prime is 401997551. The next prime is 401997569. The reversal of 401997568 is 865799104.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401997569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 915493 + ... + 915931.

Almost surely, 2^401997568 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 401997568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474187560).

401997568 is an abundant number, since it is smaller than the sum of its proper divisors (546377552).

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

401997568 is an equidigital number, since it uses as much as digits as its factorization.

401997568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 401997568 is about 20049.8770071041. The cubic root of 401997568 is about 738.0307809029.

The spelling of 401997568 in words is "four hundred one million, nine hundred ninety-seven thousand, five hundred sixty-eight".