42009998 has 4 divisors (see below), whose sum is σ = 63015000. Its totient is φ = 21004998.

The previous prime is 42009971. The next prime is 42010013. The reversal of 42009998 is 89990024.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502498 + ... + 10502501.

It is an arithmetic number, because the mean of its divisors is an integer number (15753750).

Almost surely, 2^42009998 is an apocalyptic number.

42009998 is a deficient number, since it is larger than the sum of its proper divisors (21005002).

42009998 is a wasteful number, since it uses less digits than its factorization.

42009998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21005001.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 42009998 is about 6481.5120149545. The cubic root of 42009998 is about 347.6302442959.

The spelling of 42009998 in words is "forty-two million, nine thousand, nine hundred ninety-eight".