400240012 has 6 divisors (see below), whose sum is σ = 700420028. Its totient is φ = 200120004.

The previous prime is 400240003. The next prime is 400240019. The reversal of 400240012 is 210042004.

It is a junction number, because it is equal to n+sod(n) for n = 400239974 and 400240001.

It is not an unprimeable number, because it can be changed into a prime (400240019) 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 as a sum of consecutive naturals, namely, 50029998 + ... + 50030005.

Almost surely, 2^400240012 is an apocalyptic number.

It is an amenable number.

400240012 is a deficient number, since it is larger than the sum of its proper divisors (300180016).

400240012 is a wasteful number, since it uses less digits than its factorization.

400240012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100060007 (or 100060005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 400240012 is about 20005.9994001799. Note that the first 3 decimals coincide. The cubic root of 400240012 is about 736.9536388907.

Adding to 400240012 its reverse (210042004), we get a palindrome (610282016).

The spelling of 400240012 in words is "four hundred million, two hundred forty thousand, twelve".