400647853 has 4 divisors (see below), whose sum is σ = 400690048. Its totient is φ = 400605660.

The previous prime is 400647839. The next prime is 400647883. The reversal of 400647853 is 358746004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 400647853 - 2⁹ = 400647341 is a prime.

It is a super-2 number, since 2×400647853² = 321037404227019218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400647883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550 + ... + 28312.

It is an arithmetic number, because the mean of its divisors is an integer number (100172512).

Almost surely, 2^400647853 is an apocalyptic number.

It is an amenable number.

400647853 is a deficient number, since it is larger than the sum of its proper divisors (42195).

400647853 is a wasteful number, since it uses less digits than its factorization.

400647853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42194.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 400647853 is about 20016.1897722818. The cubic root of 400647853 is about 737.2038703089.

The spelling of 400647853 in words is "four hundred million, six hundred forty-seven thousand, eight hundred fifty-three".