400424240 has 40 divisors (see below), whose sum is σ = 979989360. Its totient is φ = 151739136.

The previous prime is 400424237. The next prime is 400424267. The reversal of 400424240 is 42424004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 7 ways as a sum of consecutive naturals, for example, 130199 + ... + 133238.

It is an arithmetic number, because the mean of its divisors is an integer number (24499734).

Almost surely, 2^400424240 is an apocalyptic number.

400424240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400424240 is an abundant number, since it is smaller than the sum of its proper divisors (579565120).

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

400424240 is a wasteful number, since it uses less digits than its factorization.

400424240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263469 (or 263463 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 400424240 is about 20010.6031893094. The cubic root of 400424240 is about 737.0666932791.

Adding to 400424240 its reverse (42424004), we get a palindrome (442848244).

The spelling of 400424240 in words is "four hundred million, four hundred twenty-four thousand, two hundred forty".