42115405 has 8 divisors (see below), whose sum is σ = 51771384. Its totient is φ = 32870400.

The previous prime is 42115399. The next prime is 42115417. The reversal of 42115405 is 50451124.

It can be written as a sum of positive squares in 4 ways, for example, as 4990756 + 37124649 = 2234^2 + 6093^2 .

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

It is not a de Polignac number, because 42115405 - 2³ = 42115397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102516 + ... + 102925.

It is an arithmetic number, because the mean of its divisors is an integer number (6471423).

Almost surely, 2^42115405 is an apocalyptic number.

It is an amenable number.

42115405 is a deficient number, since it is larger than the sum of its proper divisors (9655979).

42115405 is a wasteful number, since it uses less digits than its factorization.

42115405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205487.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 42115405 is about 6489.6382795962. The cubic root of 42115405 is about 347.9207470249.

Adding to 42115405 its reverse (50451124), we get a palindrome (92566529).

The spelling of 42115405 in words is "forty-two million, one hundred fifteen thousand, four hundred five".