42000139 has 4 divisors (see below), whose sum is σ = 43826256. Its totient is φ = 40174024.

The previous prime is 42000137. The next prime is 42000191. The reversal of 42000139 is 93100024.

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 42000139 - 2¹ = 42000137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42000131) 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, 913024 + ... + 913069.

It is an arithmetic number, because the mean of its divisors is an integer number (10956564).

Almost surely, 2^42000139 is an apocalyptic number.

42000139 is a deficient number, since it is larger than the sum of its proper divisors (1826117).

42000139 is a wasteful number, since it uses less digits than its factorization.

42000139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826116.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 42000139 is about 6480.7514224818. The cubic root of 42000139 is about 347.6030479547.

The spelling of 42000139 in words is "forty-two million, one hundred thirty-nine", and thus it is an aban number.