400678 has 8 divisors (see below), whose sum is σ = 608040. Its totient is φ = 198000.

The previous prime is 400657. The next prime is 400679. The reversal of 400678 is 876004.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400679) by changing a digit.

400678 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 in 3 ways as a sum of consecutive naturals, for example, 948 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (76005).

2⁴⁰⁰⁶⁷⁸ is an apocalyptic number.

400678 is a deficient number, since it is larger than the sum of its proper divisors (207362).

400678 is a wasteful number, since it uses less digits than its factorization.

400678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 400678 is about 632.9913111568. The cubic root of 400678 is about 73.7222360302.

The spelling of 400678 in words is "four hundred thousand, six hundred seventy-eight".