400816842 has 16 divisors (see below), whose sum is σ = 803490240. Its totient is φ = 133296192.

The previous prime is 400816841. The next prime is 400816853. The reversal of 400816842 is 248618004.

It is not an unprimeable number, because it can be changed into a prime (400816841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74542 + ... + 79737.

It is an arithmetic number, because the mean of its divisors is an integer number (50218140).

Almost surely, 2^400816842 is an apocalyptic number.

400816842 is an abundant number, since it is smaller than the sum of its proper divisors (402673398).

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

400816842 is a wasteful number, since it uses less digits than its factorization.

400816842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154717.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 400816842 is about 20020.4106351493. The cubic root of 400816842 is about 737.3075039884.

The spelling of 400816842 in words is "four hundred million, eight hundred sixteen thousand, eight hundred forty-two".