42129955 has 24 divisors (see below), whose sum is σ = 59795280. Its totient is φ = 28405440.

The previous prime is 42129949. The next prime is 42129959. The reversal of 42129955 is 55992124.

It is not a de Polignac number, because 42129955 - 2²¹ = 40032803 is a prime.

It is a super-3 number, since 3×42129955³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (42129959) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 13536 + ... + 16354.

It is an arithmetic number, because the mean of its divisors is an integer number (2491470).

Almost surely, 2^42129955 is an apocalyptic number.

42129955 is a deficient number, since it is larger than the sum of its proper divisors (17665325).

42129955 is a wasteful number, since it uses less digits than its factorization.

42129955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899 (or 2892 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 42129955 is about 6490.7592005866. The cubic root of 42129955 is about 347.9608088820.

The spelling of 42129955 in words is "forty-two million, one hundred twenty-nine thousand, nine hundred fifty-five".