42440004 has 24 divisors (see below), whose sum is σ = 110029920. Its totient is φ = 14146632.

The previous prime is 42439981. The next prime is 42440029. The reversal of 42440004 is 40004424.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196374 + ... + 196589.

It is an arithmetic number, because the mean of its divisors is an integer number (4584580).

Almost surely, 2^42440004 is an apocalyptic number.

It is an amenable number.

42440004 is an abundant number, since it is smaller than the sum of its proper divisors (67589916).

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

42440004 is a wasteful number, since it uses less digits than its factorization.

42440004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392976 (or 392968 counting only the distinct ones).

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

The square root of 42440004 is about 6514.5992969637. The cubic root of 42440004 is about 348.8123116779.

Adding to 42440004 its reverse (40004424), we get a palindrome (82444428).

The spelling of 42440004 in words is "forty-two million, four hundred forty thousand, four".