400040022 has 32 divisors (see below), whose sum is σ = 891734400. Its totient is φ = 118896768.

The previous prime is 400040021. The next prime is 400040023. The reversal of 400040022 is 220040004.

It is an interprime number because it is at equal distance from previous prime (400040021) and next prime (400040023).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101272 + ... + 105147.

It is an arithmetic number, because the mean of its divisors is an integer number (27866700).

Almost surely, 2^400040022 is an apocalyptic number.

400040022 is an abundant number, since it is smaller than the sum of its proper divisors (491694378).

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

400040022 is a wasteful number, since it uses less digits than its factorization.

400040022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206460.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400040022 is about 20001.0005249737. Note that the first 3 decimals coincide. The cubic root of 400040022 is about 736.8308726267.

Adding to 400040022 its reverse (220040004), we get a palindrome (620080026).

The spelling of 400040022 in words is "four hundred million, forty thousand, twenty-two".