400421501442 has 24 divisors (see below), whose sum is σ = 867747061116. Its totient is φ = 133448119776.

The previous prime is 400421501407. The next prime is 400421501453. The reversal of 400421501442 is 244105124004.

400421501442 is a `hidden beast` number, since 4 + 0 + 0 + 4 + 215 + 0 + 1 + 442 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 342811421001 + 57610080441 = 585501^2 + 240021^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2046693 + ... + 2233784.

Almost surely, 2^400421501442 is an apocalyptic number.

400421501442 is an abundant number, since it is smaller than the sum of its proper divisors (467325559674).

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

400421501442 is a wasteful number, since it uses less digits than its factorization.

400421501442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285682 (or 4285679 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 400421501442 its reverse (244105124004), we get a palindrome (644526625446).

The spelling of 400421501442 in words is "four hundred billion, four hundred twenty-one million, five hundred one thousand, four hundred forty-two".