42687929 has 4 divisors (see below), whose sum is σ = 43729140. Its totient is φ = 41646720.

The previous prime is 42687917. The next prime is 42687989. The reversal of 42687929 is 92978624.

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 15366400 + 27321529 = 3920^2 + 5227^2 .

It is a cyclic number.

It is not a de Polignac number, because 42687929 - 2¹² = 42683833 is a prime.

It is a super-3 number, since 3×42687929³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42687989) 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, 520544 + ... + 520625.

It is an arithmetic number, because the mean of its divisors is an integer number (10932285).

Almost surely, 2^42687929 is an apocalyptic number.

It is an amenable number.

42687929 is a deficient number, since it is larger than the sum of its proper divisors (1041211).

42687929 is a wasteful number, since it uses less digits than its factorization.

42687929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041210.

The product of its digits is 435456, while the sum is 47.

The square root of 42687929 is about 6533.6000030611. The cubic root of 42687929 is about 349.4902211272.

The spelling of 42687929 in words is "forty-two million, six hundred eighty-seven thousand, nine hundred twenty-nine".