400240442 has 64 divisors (see below), whose sum is σ = 736985088. Its totient is φ = 159408000.

The previous prime is 400240439. The next prime is 400240493. The reversal of 400240442 is 244042004.

It is a super-2 number, since 2×400240442² = 320384822824710728, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 1476767 + ... + 1477037.

It is an arithmetic number, because the mean of its divisors is an integer number (11515392).

Almost surely, 2^400240442 is an apocalyptic number.

400240442 is a deficient number, since it is larger than the sum of its proper divisors (336744646).

400240442 is a wasteful number, since it uses less digits than its factorization.

400240442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435.

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

The square root of 400240442 is about 20006.0101469533. The cubic root of 400240442 is about 736.9539028073.

Adding to 400240442 its reverse (244042004), we get a palindrome (644282446).

It can be divided in two parts, 4002 and 40442, that added together give a palindrome (44444).

The spelling of 400240442 in words is "four hundred million, two hundred forty thousand, four hundred forty-two".