406387 has 4 divisors (see below), whose sum is σ = 424080. Its totient is φ = 388696.

The previous prime is 406381. The next prime is 406397. The reversal of 406387 is 783604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8812 + ... + 8857.

It is an arithmetic number, because the mean of its divisors is an integer number (106020).

2⁴⁰⁶³⁸⁷ is an apocalyptic number.

406387 is a deficient number, since it is larger than the sum of its proper divisors (17693).

406387 is a wasteful number, since it uses less digits than its factorization.

406387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17692.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 406387 is about 637.4849017820. The cubic root of 406387 is about 74.0707261481.

The spelling of 406387 in words is "four hundred six thousand, three hundred eighty-seven".