400816853 has 2 divisors, whose sum is σ = 400816854. Its totient is φ = 400816852.

The previous prime is 400816841. The next prime is 400816873. The reversal of 400816853 is 358618004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253510084 + 147306769 = 15922^2 + 12137^2 .

It is a cyclic number.

It is not a de Polignac number, because 400816853 - 2⁶ = 400816789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400816813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200408426 + 200408427.

It is an arithmetic number, because the mean of its divisors is an integer number (200408427).

Almost surely, 2^400816853 is an apocalyptic number.

It is an amenable number.

400816853 is a deficient number, since it is larger than the sum of its proper divisors (1).

400816853 is an equidigital number, since it uses as much as digits as its factorization.

400816853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 400816853 is about 20020.4109098690. The cubic root of 400816853 is about 737.3075107333.

The spelling of 400816853 in words is "four hundred million, eight hundred sixteen thousand, eight hundred fifty-three".