401966 has 4 divisors (see below), whose sum is σ = 602952. Its totient is φ = 200982.

The previous prime is 401959. The next prime is 401981. The reversal of 401966 is 669104.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

401966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100490 + ... + 100493.

It is an arithmetic number, because the mean of its divisors is an integer number (150738).

2⁴⁰¹⁹⁶⁶ is an apocalyptic number.

401966 is a deficient number, since it is larger than the sum of its proper divisors (200986).

401966 is a wasteful number, since it uses less digits than its factorization.

401966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200985.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 401966 is about 634.0078863863. The cubic root of 401966 is about 73.8011461743.

The spelling of 401966 in words is "four hundred one thousand, nine hundred sixty-six".