42139120 has 20 divisors (see below), whose sum is σ = 97973640. Its totient is φ = 16855616.

The previous prime is 42139109. The next prime is 42139121. The reversal of 42139120 is 2193124.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 42139091 and 42139100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42139121) 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, 263290 + ... + 263449.

It is an arithmetic number, because the mean of its divisors is an integer number (4898682).

Almost surely, 2^42139120 is an apocalyptic number.

42139120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42139120 is an abundant number, since it is smaller than the sum of its proper divisors (55834520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42139120 is a wasteful number, since it uses less digits than its factorization.

42139120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526752 (or 526746 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 42139120 is about 6491.4651658928. The cubic root of 42139120 is about 347.9860389872.

The spelling of 42139120 in words is "forty-two million, one hundred thirty-nine thousand, one hundred twenty".