400836871 has 4 divisors (see below), whose sum is σ = 401239912. Its totient is φ = 400433832.

The previous prime is 400836817. The next prime is 400836889. The reversal of 400836871 is 178638004.

It is a happy number.

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 400836871 - 2¹³ = 400828679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400836871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400839871) 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, 200025 + ... + 202018.

It is an arithmetic number, because the mean of its divisors is an integer number (100309978).

Almost surely, 2^400836871 is an apocalyptic number.

400836871 is a deficient number, since it is larger than the sum of its proper divisors (403041).

400836871 is an equidigital number, since it uses as much as digits as its factorization.

400836871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403040.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 400836871 is about 20020.9108434157. The cubic root of 400836871 is about 737.3197849810.

The spelling of 400836871 in words is "four hundred million, eight hundred thirty-six thousand, eight hundred seventy-one".