400386 has 16 divisors (see below), whose sum is σ = 915264. Its totient is φ = 114384.

The previous prime is 400381. The next prime is 400391. The reversal of 400386 is 683004.

It is an interprime number because it is at equal distance from previous prime (400381) and next prime (400391).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400381) by changing a digit.

400386 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 7 ways as a sum of consecutive naturals, for example, 4725 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (57204).

2⁴⁰⁰³⁸⁶ is an apocalyptic number.

400386 is an abundant number, since it is smaller than the sum of its proper divisors (514878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400386 is a wasteful number, since it uses less digits than its factorization.

400386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9545.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 400386 is about 632.7606182436. The cubic root of 400386 is about 73.7043229558.

The spelling of 400386 in words is "four hundred thousand, three hundred eighty-six".