400047820 has 24 divisors (see below), whose sum is σ = 840536928. Its totient is φ = 159936000.

The previous prime is 400047797. The next prime is 400047883. The reversal of 400047820 is 28740004.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 47100 + ... + 54940.

It is an arithmetic number, because the mean of its divisors is an integer number (35022372).

Almost surely, 2^400047820 is an apocalyptic number.

It is an amenable number.

400047820 is an abundant number, since it is smaller than the sum of its proper divisors (440489108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400047820 is a wasteful number, since it uses less digits than its factorization.

400047820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401 (or 10399 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 400047820 is about 20001.1954642716. The cubic root of 400047820 is about 736.8356602891.

Adding to 400047820 its reverse (28740004), we get a palindrome (428787824).

The spelling of 400047820 in words is "four hundred million, forty-seven thousand, eight hundred twenty".