42139099 has 4 divisors (see below), whose sum is σ = 42233400. Its totient is φ = 42044800.

The previous prime is 42139087. The next prime is 42139109. The reversal of 42139099 is 99093124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42139099 - 2⁹ = 42138587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42139049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46477 + ... + 47374.

It is an arithmetic number, because the mean of its divisors is an integer number (10558350).

Almost surely, 2^42139099 is an apocalyptic number.

42139099 is a deficient number, since it is larger than the sum of its proper divisors (94301).

42139099 is an equidigital number, since it uses as much as digits as its factorization.

42139099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94300.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 42139099 is about 6491.4635483841. The cubic root of 42139099 is about 347.9859811810.

The spelling of 42139099 in words is "forty-two million, one hundred thirty-nine thousand, ninety-nine".