42125779 has 4 divisors (see below), whose sum is σ = 44603784. Its totient is φ = 39647776.

The previous prime is 42125761. The next prime is 42125789. The reversal of 42125779 is 97752124.

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 42125779 - 2⁷ = 42125651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42125729) 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, 1238977 + ... + 1239010.

It is an arithmetic number, because the mean of its divisors is an integer number (11150946).

Almost surely, 2^42125779 is an apocalyptic number.

42125779 is a deficient number, since it is larger than the sum of its proper divisors (2478005).

42125779 is a wasteful number, since it uses less digits than its factorization.

42125779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478004.

The product of its digits is 35280, while the sum is 37.

The square root of 42125779 is about 6490.4375045139. The cubic root of 42125779 is about 347.9493116599.

The spelling of 42125779 in words is "forty-two million, one hundred twenty-five thousand, seven hundred seventy-nine".