401996 has 24 divisors (see below), whose sum is σ = 823200. Its totient is φ = 171696.

The previous prime is 401993. The next prime is 402023. The reversal of 401996 is 699104.

It is not an unprimeable number, because it can be changed into a prime (401993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226 + ... + 1518.

It is an arithmetic number, because the mean of its divisors is an integer number (34300).

2⁴⁰¹⁹⁹⁶ 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 401996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411600).

401996 is an abundant number, since it is smaller than the sum of its proper divisors (421204).

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

401996 is a wasteful number, since it uses less digits than its factorization.

401996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 401996 is about 634.0315449566. The cubic root of 401996 is about 73.8029821333.

The spelling of 401996 in words is "four hundred one thousand, nine hundred ninety-six".