42129636 has 12 divisors (see below), whose sum is σ = 98302512. Its totient is φ = 14043208.

The previous prime is 42129559. The next prime is 42129641. The reversal of 42129636 is 63692124.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 42129597 and 42129606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755390 + ... + 1755413.

It is an arithmetic number, because the mean of its divisors is an integer number (8191876).

Almost surely, 2^42129636 is an apocalyptic number.

It is an amenable number.

42129636 is an abundant number, since it is smaller than the sum of its proper divisors (56172876).

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

42129636 is a wasteful number, since it uses less digits than its factorization.

42129636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510810 (or 3510808 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 42129636 is about 6490.7346271435. The cubic root of 42129636 is about 347.9599306488.

The spelling of 42129636 in words is "forty-two million, one hundred twenty-nine thousand, six hundred thirty-six".