42399999 has 12 divisors (see below), whose sum is σ = 61305400. Its totient is φ = 28238544.

The previous prime is 42399983. The next prime is 42400009. The reversal of 42399999 is 99999324.

It is not a de Polignac number, because 42399999 - 2⁴ = 42399983 is a prime.

It is a Duffinian number.

42399999 is a modest number, since divided by 9999 gives 4239 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42399979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11517 + ... + 14745.

Almost surely, 2^42399999 is an apocalyptic number.

42399999 is a deficient number, since it is larger than the sum of its proper divisors (18905401).

42399999 is a wasteful number, since it uses less digits than its factorization.

42399999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694 (or 4691 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 42399999 is about 6511.5281616530. The cubic root of 42399999 is about 348.7026775117.

The spelling of 42399999 in words is "forty-two million, three hundred ninety-nine thousand, nine hundred ninety-nine".