401643 has 12 divisors (see below), whose sum is σ = 633048. Its totient is φ = 243360.

The previous prime is 401629. The next prime is 401651. The reversal of 401643 is 346104.

It is not a de Polignac number, because 401643 - 2⁴ = 401627 is a prime.

It is a super-2 number, since 2×401643² = 322634198898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401243) 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, 1930 + ... + 2127.

It is an arithmetic number, because the mean of its divisors is an integer number (52754).

2⁴⁰¹⁶⁴³ is an apocalyptic number.

401643 is a deficient number, since it is larger than the sum of its proper divisors (231405).

401643 is a wasteful number, since it uses less digits than its factorization.

401643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4074 (or 4071 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 401643 is about 633.7531065013. The cubic root of 401643 is about 73.7813732267.

Adding to 401643 its reverse (346104), we get a palindrome (747747).

The spelling of 401643 in words is "four hundred one thousand, six hundred forty-three".