42098939 has 2 divisors, whose sum is σ = 42098940. Its totient is φ = 42098938.

The previous prime is 42098929. The next prime is 42098963. The reversal of 42098939 is 93989024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42098939 - 2²⁰ = 41050363 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42098939.

It is not a weakly prime, because it can be changed into another prime (42098909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21049469 + 21049470.

It is an arithmetic number, because the mean of its divisors is an integer number (21049470).

Almost surely, 2^42098939 is an apocalyptic number.

42098939 is a deficient number, since it is larger than the sum of its proper divisors (1).

42098939 is an equidigital number, since it uses as much as digits as its factorization.

42098939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 42098939 is about 6488.3695178373. The cubic root of 42098939 is about 347.8753985370.

The spelling of 42098939 in words is "forty-two million, ninety-eight thousand, nine hundred thirty-nine".