42131405 has 8 divisors (see below), whose sum is σ = 50815512. Its totient is φ = 33533248.

The previous prime is 42131399. The next prime is 42131407. The reversal of 42131405 is 50413124.

It can be written as a sum of positive squares in 4 ways, for example, as 6538249 + 35593156 = 2557^2 + 5966^2 .

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 42131405 - 2¹⁰ = 42130381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20402 + ... + 22371.

It is an arithmetic number, because the mean of its divisors is an integer number (6351939).

Almost surely, 2^42131405 is an apocalyptic number.

It is an amenable number.

42131405 is a deficient number, since it is larger than the sum of its proper divisors (8684107).

42131405 is a wasteful number, since it uses less digits than its factorization.

42131405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42975.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 42131405 is about 6490.8708968828. The cubic root of 42131405 is about 347.9648007953.

Adding to 42131405 its reverse (50413124), we get a palindrome (92544529).

The spelling of 42131405 in words is "forty-two million, one hundred thirty-one thousand, four hundred five".