42940123 has 4 divisors (see below), whose sum is σ = 43750368. Its totient is φ = 42129880.

The previous prime is 42940111. The next prime is 42940153. The reversal of 42940123 is 32104924.

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

It is a cyclic number.

It is not a de Polignac number, because 42940123 - 2¹⁷ = 42809051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42940153) 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, 405043 + ... + 405148.

It is an arithmetic number, because the mean of its divisors is an integer number (10937592).

Almost surely, 2^42940123 is an apocalyptic number.

42940123 is a deficient number, since it is larger than the sum of its proper divisors (810245).

42940123 is an equidigital number, since it uses as much as digits as its factorization.

42940123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810244.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42940123 is about 6552.8713553678. The cubic root of 42940123 is about 350.1771157985.

The spelling of 42940123 in words is "forty-two million, nine hundred forty thousand, one hundred twenty-three".