42139342 has 8 divisors (see below), whose sum is σ = 72238896. Its totient is φ = 18059712.

The previous prime is 42139327. The next prime is 42139343. The reversal of 42139342 is 24393124.

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

It is a self number, because there is not a number n which added to its sum of digits gives 42139342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42139343) 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, 1504963 + ... + 1504990.

It is an arithmetic number, because the mean of its divisors is an integer number (9029862).

Almost surely, 2^42139342 is an apocalyptic number.

42139342 is a deficient number, since it is larger than the sum of its proper divisors (30099554).

42139342 is a wasteful number, since it uses less digits than its factorization.

42139342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3009962.

The product of its digits is 5184, while the sum is 28.

The square root of 42139342 is about 6491.4822652457. The cubic root of 42139342 is about 347.9866500802.

It can be divided in two parts, 4 and 2139342, that added together give a triangular number (2139346 = T₂₀₆₈).

The spelling of 42139342 in words is "forty-two million, one hundred thirty-nine thousand, three hundred forty-two".