42999821 has 8 divisors (see below), whose sum is σ = 44623104. Its totient is φ = 41391360.

The previous prime is 42999797. The next prime is 42999823. The reversal of 42999821 is 12899924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42999821 - 2⁶ = 42999757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42999823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2390 + ... + 9576.

It is an arithmetic number, because the mean of its divisors is an integer number (5577888).

Almost surely, 2^42999821 is an apocalyptic number.

It is an amenable number.

42999821 is a deficient number, since it is larger than the sum of its proper divisors (1623283).

42999821 is a wasteful number, since it uses less digits than its factorization.

42999821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7411.

The product of its digits is 93312, while the sum is 44.

The square root of 42999821 is about 6557.4248756658. The cubic root of 42999821 is about 350.3393199076.

The spelling of 42999821 in words is "forty-two million, nine hundred ninety-nine thousand, eight hundred twenty-one".