401668 has 6 divisors (see below), whose sum is σ = 702926. Its totient is φ = 200832.

The previous prime is 401651. The next prime is 401669. The reversal of 401668 is 866104.

It can be written as a sum of positive squares in only one way, i.e., 248004 + 153664 = 498^2 + 392^2 .

It is a super-2 number, since 2×401668² = 322674364448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401669) by changing a digit.

401668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50205 + ... + 50212.

2⁴⁰¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

401668 is a deficient number, since it is larger than the sum of its proper divisors (301258).

401668 is a wasteful number, since it uses less digits than its factorization.

401668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100421 (or 100419 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 401668 is about 633.7728299635. The cubic root of 401668 is about 73.7829040190.

The spelling of 401668 in words is "four hundred one thousand, six hundred sixty-eight".