400422040 has 32 divisors (see below), whose sum is σ = 930015360. Its totient is φ = 155001600.

The previous prime is 400421993. The next prime is 400422041. The reversal of 400422040 is 40224004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400422041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160221 + ... + 162700.

It is an arithmetic number, because the mean of its divisors is an integer number (29062980).

Almost surely, 2^400422040 is an apocalyptic number.

400422040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400422040 is an abundant number, since it is smaller than the sum of its proper divisors (529593320).

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

400422040 is a wasteful number, since it uses less digits than its factorization.

400422040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322963 (or 322959 counting only the distinct ones).

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

The square root of 400422040 is about 20010.5482183772. The cubic root of 400422040 is about 737.0653434194.

Adding to 400422040 its reverse (40224004), we get a palindrome (440646044).

The spelling of 400422040 in words is "four hundred million, four hundred twenty-two thousand, forty".