42940129 has 4 divisors (see below), whose sum is σ = 42964884. Its totient is φ = 42915376.

The previous prime is 42940111. The next prime is 42940153. The reversal of 42940129 is 92104924.

It is a happy number.

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 33005025 + 9935104 = 5745^2 + 3152^2 .

It is a cyclic number.

It is not a de Polignac number, because 42940129 - 2¹³ = 42931937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42940129.

It is not an unprimeable number, because it can be changed into a prime (42940109) 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, 9562 + ... + 13315.

It is an arithmetic number, because the mean of its divisors is an integer number (10741221).

Almost surely, 2^42940129 is an apocalyptic number.

It is an amenable number.

42940129 is a deficient number, since it is larger than the sum of its proper divisors (24755).

42940129 is a wasteful number, since it uses less digits than its factorization.

42940129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24754.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 42940129 is about 6552.8718131824. The cubic root of 42940129 is about 350.1771321085.

The spelling of 42940129 in words is "forty-two million, nine hundred forty thousand, one hundred twenty-nine".