400851 has 12 divisors (see below), whose sum is σ = 631800. Its totient is φ = 242880.

The previous prime is 400849. The next prime is 400853. The reversal of 400851 is 158004.

It is an interprime number because it is at equal distance from previous prime (400849) and next prime (400853).

It is not a de Polignac number, because 400851 - 2¹ = 400849 is a prime.

400851 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400851.

It is not an unprimeable number, because it can be changed into a prime (400853) 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 11 ways as a sum of consecutive naturals, for example, 1926 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (52650).

2⁴⁰⁰⁸⁵¹ is an apocalyptic number.

400851 is a deficient number, since it is larger than the sum of its proper divisors (230949).

400851 is a wasteful number, since it uses less digits than its factorization.

400851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066 (or 4063 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 400851 is about 633.1279491540. The cubic root of 400851 is about 73.7328448080.

Adding to 400851 its reverse (158004), we get a palindrome (558855).

The spelling of 400851 in words is "four hundred thousand, eight hundred fifty-one".