42811729 has 4 divisors (see below), whose sum is σ = 45330084. Its totient is φ = 40293376.

The previous prime is 42811721. The next prime is 42811733. The reversal of 42811729 is 92711824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12616704 + 30195025 = 3552^2 + 5495^2 .

It is a cyclic number.

It is not a de Polignac number, because 42811729 - 2³ = 42811721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42811694 and 42811703.

It is not an unprimeable number, because it can be changed into a prime (42811721) 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, 1259152 + ... + 1259185.

It is an arithmetic number, because the mean of its divisors is an integer number (11332521).

Almost surely, 2^42811729 is an apocalyptic number.

It is an amenable number.

42811729 is a deficient number, since it is larger than the sum of its proper divisors (2518355).

42811729 is a wasteful number, since it uses less digits than its factorization.

42811729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518354.

The product of its digits is 8064, while the sum is 34.

The square root of 42811729 is about 6543.0672470944. The cubic root of 42811729 is about 349.8277492552.

The spelling of 42811729 in words is "forty-two million, eight hundred eleven thousand, seven hundred twenty-nine".