42129491 has 8 divisors (see below), whose sum is σ = 44094240. Its totient is φ = 40175872.

The previous prime is 42129463. The next prime is 42129497. The reversal of 42129491 is 19492124.

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

It is a cyclic number.

It is not a de Polignac number, because 42129491 - 2¹⁰ = 42128467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42129497) 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 7 ways as a sum of consecutive naturals, for example, 5525 + ... + 10713.

It is an arithmetic number, because the mean of its divisors is an integer number (5511780).

Almost surely, 2^42129491 is an apocalyptic number.

42129491 is a deficient number, since it is larger than the sum of its proper divisors (1964749).

42129491 is a wasteful number, since it uses less digits than its factorization.

42129491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5565.

The product of its digits is 5184, while the sum is 32.

The square root of 42129491 is about 6490.7234573659. The cubic root of 42129491 is about 347.9595314504.

The spelling of 42129491 in words is "forty-two million, one hundred twenty-nine thousand, four hundred ninety-one".