42921999 has 6 divisors (see below), whose sum is σ = 61998456. Its totient is φ = 28614660.

The previous prime is 42921973. The next prime is 42922013. The reversal of 42921999 is 99912924.

42921999 is a `hidden beast` number, since 429 + 219 + 9 + 9 = 666.

42921999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42921999 - 2⁸ = 42921743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42921959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2384547 + ... + 2384564.

It is an arithmetic number, because the mean of its divisors is an integer number (10333076).

Almost surely, 2^42921999 is an apocalyptic number.

42921999 is a deficient number, since it is larger than the sum of its proper divisors (19076457).

42921999 is a wasteful number, since it uses less digits than its factorization.

42921999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4769117 (or 4769114 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 42921999 is about 6551.4883041947. The cubic root of 42921999 is about 350.1278417339.

The spelling of 42921999 in words is "forty-two million, nine hundred twenty-one thousand, nine hundred ninety-nine".