400888820 has 48 divisors (see below), whose sum is σ = 864597888. Its totient is φ = 156074880.

The previous prime is 400888819. The next prime is 400888823. The reversal of 400888820 is 28888004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400888823) 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 15 ways as a sum of consecutive naturals, for example, 137417 + ... + 140303.

It is an arithmetic number, because the mean of its divisors is an integer number (18012456).

Almost surely, 2^400888820 is an apocalyptic number.

It is an amenable number.

400888820 is an abundant number, since it is smaller than the sum of its proper divisors (463709068).

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

400888820 is a wasteful number, since it uses less digits than its factorization.

400888820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080 (or 3078 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 38.

The square root of 400888820 is about 20022.2081699297. The cubic root of 400888820 is about 737.3516361518.

The spelling of 400888820 in words is "four hundred million, eight hundred eighty-eight thousand, eight hundred twenty".