42129418 has 8 divisors (see below), whose sum is σ = 63655812. Its totient is φ = 20910816.

The previous prime is 42129413. The next prime is 42129419. The reversal of 42129418 is 81492124.

It can be written as a sum of positive squares in 2 ways, for example, as 39350529 + 2778889 = 6273^2 + 1667^2 .

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

It is a super-2 number, since 2×42129418² = 3549775722037448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42129418.

It is not an unprimeable number, because it can be changed into a prime (42129413) 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, 76605 + ... + 77152.

Almost surely, 2^42129418 is an apocalyptic number.

42129418 is a deficient number, since it is larger than the sum of its proper divisors (21526394).

42129418 is a wasteful number, since it uses less digits than its factorization.

42129418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153896.

The product of its digits is 4608, while the sum is 31.

The square root of 42129418 is about 6490.7178339533. The cubic root of 42129418 is about 347.9593304743.

The spelling of 42129418 in words is "forty-two million, one hundred twenty-nine thousand, four hundred eighteen".