400024442 has 16 divisors (see below), whose sum is σ = 646308960. Its totient is φ = 185077872.

The previous prime is 400024409. The next prime is 400024447. The reversal of 400024442 is 244420004.

It is a super-2 number, since 2×400024442² = 320039108394822728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400024447) 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, 120773 + ... + 124040.

It is an arithmetic number, because the mean of its divisors is an integer number (40394310).

Almost surely, 2^400024442 is an apocalyptic number.

400024442 is a deficient number, since it is larger than the sum of its proper divisors (246284518).

400024442 is a wasteful number, since it uses less digits than its factorization.

400024442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244877.

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

The square root of 400024442 is about 20000.6110406657. The cubic root of 400024442 is about 736.8213069387.

Adding to 400024442 its reverse (244420004), we get a palindrome (644444446).

It can be divided in two parts, 40002 and 4442, that added together give a palindrome (44444).

The spelling of 400024442 in words is "four hundred million, twenty-four thousand, four hundred forty-two".