42155705 has 16 divisors (see below), whose sum is σ = 52557120. Its totient is φ = 32421312.

The previous prime is 42155693. The next prime is 42155713. The reversal of 42155705 is 50755124.

It is a cyclic number.

It is not a de Polignac number, because 42155705 - 2¹⁰ = 42154681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44042 + ... + 44988.

It is an arithmetic number, because the mean of its divisors is an integer number (3284820).

Almost surely, 2^42155705 is an apocalyptic number.

It is an amenable number.

42155705 is a deficient number, since it is larger than the sum of its proper divisors (10401415).

42155705 is a wasteful number, since it uses less digits than its factorization.

42155705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 42155705 is about 6492.7424868079. The cubic root of 42155705 is about 348.0316861314.

The spelling of 42155705 in words is "forty-two million, one hundred fifty-five thousand, seven hundred five".