400220042 has 8 divisors (see below), whose sum is σ = 608785632. Its totient is φ = 197291500.

The previous prime is 400220027. The next prime is 400220071. The reversal of 400220042 is 240022004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 400219999 and 400220026.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1409084 + ... + 1409367.

It is an arithmetic number, because the mean of its divisors is an integer number (76098204).

Almost surely, 2^400220042 is an apocalyptic number.

400220042 is a deficient number, since it is larger than the sum of its proper divisors (208565590).

400220042 is a wasteful number, since it uses less digits than its factorization.

400220042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818524.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 400220042 is about 20005.5002936692. The cubic root of 400220042 is about 736.9413819045.

Adding to 400220042 its reverse (240022004), we get a palindrome (640242046).

It can be divided in two parts, 40022004 and 2, that multiplied together give a palindrome (80044008).

The spelling of 400220042 in words is "four hundred million, two hundred twenty thousand, forty-two".