400422240 has 72 divisors (see below), whose sum is σ = 1366445808. Its totient is φ = 106778880.

The previous prime is 400422181. The next prime is 400422247. The reversal of 400422240 is 42224004.

400422240 is a `hidden beast` number, since 4 + 0 + 0 + 422 + 240 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400422247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137596 + ... + 140475.

It is an arithmetic number, because the mean of its divisors is an integer number (18978414).

Almost surely, 2^400422240 is an apocalyptic number.

400422240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400422240 is an abundant number, since it is smaller than the sum of its proper divisors (966023568).

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

400422240 is a wasteful number, since it uses less digits than its factorization.

400422240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278092 (or 278081 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 400422240 is about 20010.5532157409. The cubic root of 400422240 is about 737.0654661341.

Adding to 400422240 its reverse (42224004), we get a palindrome (442646244).

It can be divided in two parts, 4004 and 22240, that added together give a square (26244 = 162²).

The spelling of 400422240 in words is "four hundred million, four hundred twenty-two thousand, two hundred forty".