400868 has 18 divisors (see below), whose sum is σ = 760914. Its totient is φ = 184704.

The previous prime is 400859. The next prime is 400871. The reversal of 400868 is 868004.

It can be written as a sum of positive squares in 3 ways, for example, as 1444 + 399424 = 38^2 + 632^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

400868 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 5 ways as a sum of consecutive naturals, for example, 380 + ... + 972.

It is an arithmetic number, because the mean of its divisors is an integer number (42273).

2⁴⁰⁰⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

400868 is a deficient number, since it is larger than the sum of its proper divisors (360046).

400868 is a wasteful number, since it uses less digits than its factorization.

400868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 400868 is about 633.1413744181. The cubic root of 400868 is about 73.7338871244.

The spelling of 400868 in words is "four hundred thousand, eight hundred sixty-eight".