401999872 has 48 divisors (see below), whose sum is σ = 846190800. Its totient is φ = 190402560.

The previous prime is 401999869. The next prime is 401999879. The reversal of 401999872 is 278999104.

It is not an unprimeable number, because it can be changed into a prime (401999879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33747 + ... + 44077.

It is an arithmetic number, because the mean of its divisors is an integer number (17628975).

Almost surely, 2^401999872 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 401999872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423095400).

401999872 is an abundant number, since it is smaller than the sum of its proper divisors (444190928).

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

401999872 is a wasteful number, since it uses less digits than its factorization.

401999872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10372 (or 10352 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 401999872 is about 20049.9344637333. The cubic root of 401999872 is about 738.0321908780.

The spelling of 401999872 in words is "four hundred one million, nine hundred ninety-nine thousand, eight hundred seventy-two".