400787 has 4 divisors (see below), whose sum is σ = 407640. Its totient is φ = 393936.

The previous prime is 400759. The next prime is 400823. The reversal of 400787 is 787004.

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 400787 - 2⁶ = 400723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400087) 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, 3338 + ... + 3455.

It is an arithmetic number, because the mean of its divisors is an integer number (101910).

2⁴⁰⁰⁷⁸⁷ is an apocalyptic number.

400787 is a deficient number, since it is larger than the sum of its proper divisors (6853).

400787 is an equidigital number, since it uses as much as digits as its factorization.

400787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6852.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 400787 is about 633.0774044301. The cubic root of 400787 is about 73.7289205292.

The spelling of 400787 in words is "four hundred thousand, seven hundred eighty-seven".