42909898 has 4 divisors (see below), whose sum is σ = 64364850. Its totient is φ = 21454948.

The previous prime is 42909863. The next prime is 42909917. The reversal of 42909898 is 89890924.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 31505769 + 11404129 = 5613^2 + 3377^2 .

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 as a sum of consecutive naturals, namely, 10727473 + ... + 10727476.

Almost surely, 2^42909898 is an apocalyptic number.

42909898 is a deficient number, since it is larger than the sum of its proper divisors (21454952).

42909898 is a wasteful number, since it uses less digits than its factorization.

42909898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21454951.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 42909898 is about 6550.5647084812. The cubic root of 42909898 is about 350.0949347916.

The spelling of 42909898 in words is "forty-two million, nine hundred nine thousand, eight hundred ninety-eight".