400387 has 8 divisors (see below), whose sum is σ = 454160. Its totient is φ = 349920.

The previous prime is 400381. The next prime is 400391. The reversal of 400387 is 783004.

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

It is a cyclic number.

It is not a de Polignac number, because 400387 - 2¹¹ = 398339 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

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

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 7 ways as a sum of consecutive naturals, for example, 564 + ... + 1057.

It is an arithmetic number, because the mean of its divisors is an integer number (56770).

2⁴⁰⁰³⁸⁷ is an apocalyptic number.

400387 is a deficient number, since it is larger than the sum of its proper divisors (53773).

400387 is a wasteful number, since it uses less digits than its factorization.

400387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 400387 is about 632.7614084313. The cubic root of 400387 is about 73.7043843168.

It can be divided in two parts, 400 and 387, that added together give a palindrome (787).

The spelling of 400387 in words is "four hundred thousand, three hundred eighty-seven".