401816 has 8 divisors (see below), whose sum is σ = 753420. Its totient is φ = 200904.

The previous prime is 401813. The next prime is 401827. The reversal of 401816 is 618104.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×401816² = 322912195712, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401813) 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 as a sum of consecutive naturals, namely, 25106 + ... + 25121.

2⁴⁰¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

401816 is a deficient number, since it is larger than the sum of its proper divisors (351604).

401816 is a wasteful number, since it uses less digits than its factorization.

401816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50233 (or 50229 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 401816 is about 633.8895802898. The cubic root of 401816 is about 73.7919650087.

The spelling of 401816 in words is "four hundred one thousand, eight hundred sixteen".