406787 has 4 divisors (see below), whose sum is σ = 409536. Its totient is φ = 404040.

The previous prime is 406739. The next prime is 406789. The reversal of 406787 is 787604.

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

It is a cyclic number.

It is not a de Polignac number, because 406787 - 2⁸ = 406531 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406787.

It is not an unprimeable number, because it can be changed into a prime (406789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139 + ... + 1452.

It is an arithmetic number, because the mean of its divisors is an integer number (102384).

2⁴⁰⁶⁷⁸⁷ is an apocalyptic number.

406787 is a deficient number, since it is larger than the sum of its proper divisors (2749).

406787 is a wasteful number, since it uses less digits than its factorization.

406787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 406787 is about 637.7985575399. The cubic root of 406787 is about 74.0950203757.

The spelling of 406787 in words is "four hundred six thousand, seven hundred eighty-seven".