401678 has 8 divisors (see below), whose sum is σ = 608472. Its totient is φ = 198856.

The previous prime is 401671. The next prime is 401689. The reversal of 401678 is 876104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×401678² = 322690431368, which contains 22 as substring.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401671) by changing a digit.

401678 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (76059).

2⁴⁰¹⁶⁷⁸ is an apocalyptic number.

401678 is a deficient number, since it is larger than the sum of its proper divisors (206794).

401678 is a wasteful number, since it uses less digits than its factorization.

401678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 401678 is about 633.7807191766. The cubic root of 401678 is about 73.7835163182.

The spelling of 401678 in words is "four hundred one thousand, six hundred seventy-eight".