42729889 has 4 divisors (see below), whose sum is σ = 43041924. Its totient is φ = 42417856.

The previous prime is 42729793. The next prime is 42729899. The reversal of 42729889 is 98892724.

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 11560000 + 31169889 = 3400^2 + 5583^2 .

It is a cyclic number.

It is not a de Polignac number, because 42729889 - 2¹⁵ = 42697121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42729899) 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, 155812 + ... + 156085.

It is an arithmetic number, because the mean of its divisors is an integer number (10760481).

Almost surely, 2^42729889 is an apocalyptic number.

It is an amenable number.

42729889 is a deficient number, since it is larger than the sum of its proper divisors (312035).

42729889 is a wasteful number, since it uses less digits than its factorization.

42729889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312034.

The product of its digits is 580608, while the sum is 49.

The square root of 42729889 is about 6536.8103077877. The cubic root of 42729889 is about 349.6046938271.

It can be divided in two parts, 4272 and 9889, that added together give a square (14161 = 119²).

The spelling of 42729889 in words is "forty-two million, seven hundred twenty-nine thousand, eight hundred eighty-nine".