42998939 has 2 divisors, whose sum is σ = 42998940. Its totient is φ = 42998938.

The previous prime is 42998887. The next prime is 42998941. The reversal of 42998939 is 93989924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42998939 - 2¹⁶ = 42933403 is a prime.

Together with 42998941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42991939) by changing a digit.

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, 21499469 + 21499470.

It is an arithmetic number, because the mean of its divisors is an integer number (21499470).

Almost surely, 2^42998939 is an apocalyptic number.

42998939 is a deficient number, since it is larger than the sum of its proper divisors (1).

42998939 is an equidigital number, since it uses as much as digits as its factorization.

42998939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 42998939 is about 6557.3576233114. The cubic root of 42998939 is about 350.3369245380.

The spelling of 42998939 in words is "forty-two million, nine hundred ninety-eight thousand, nine hundred thirty-nine".