400400422 has 16 divisors (see below), whose sum is σ = 663580512. Its totient is φ = 180231040.

The previous prime is 400400389. The next prime is 400400437. The reversal of 400400422 is 224004004.

It is a junction number, because it is equal to n+sod(n) for n = 400400396 and 400400405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255229 + ... + 256792.

It is an arithmetic number, because the mean of its divisors is an integer number (41473782).

Almost surely, 2^400400422 is an apocalyptic number.

400400422 is a deficient number, since it is larger than the sum of its proper divisors (263180090).

400400422 is a wasteful number, since it uses less digits than its factorization.

400400422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512063.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 400400422 is about 20010.0080459754. The cubic root of 400400422 is about 737.0520789436.

Adding to 400400422 its reverse (224004004), we get a palindrome (624404426).

It can be divided in two parts, 4004004 and 22, that multiplied together give a palindrome (88088088).

The spelling of 400400422 in words is "four hundred million, four hundred thousand, four hundred twenty-two".