42155769 has 4 divisors (see below), whose sum is σ = 56207696. Its totient is φ = 28103844.

The previous prime is 42155761. The next prime is 42155807. The reversal of 42155769 is 96755124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42155769 - 2³ = 42155761 is a prime.

It is a super-2 number, since 2×42155769² = 3554217719962722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42155761) 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, 7025959 + ... + 7025964.

It is an arithmetic number, because the mean of its divisors is an integer number (14051924).

Almost surely, 2^42155769 is an apocalyptic number.

It is an amenable number.

42155769 is a deficient number, since it is larger than the sum of its proper divisors (14051927).

42155769 is a wasteful number, since it uses less digits than its factorization.

42155769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14051926.

The product of its digits is 75600, while the sum is 39.

The square root of 42155769 is about 6492.7474153859. The cubic root of 42155769 is about 348.0318622564.

It can be divided in two parts, 42155 and 769, that added together give a palindrome (42924).

The spelling of 42155769 in words is "forty-two million, one hundred fifty-five thousand, seven hundred sixty-nine".