42003994 has 16 divisors (see below), whose sum is σ = 64800000. Its totient is φ = 20410384.

The previous prime is 42003979. The next prime is 42004009. The reversal of 42003994 is 49930024.

It is an interprime number because it is at equal distance from previous prime (42003979) and next prime (42004009).

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, 12507 + ... + 15505.

It is an arithmetic number, because the mean of its divisors is an integer number (4050000).

Almost surely, 2^42003994 is an apocalyptic number.

42003994 is a deficient number, since it is larger than the sum of its proper divisors (22796006).

42003994 is a wasteful number, since it uses less digits than its factorization.

42003994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42003994 is about 6481.0488348723. The cubic root of 42003994 is about 347.6136825921.

The spelling of 42003994 in words is "forty-two million, three thousand, nine hundred ninety-four".