42031779 has 4 divisors (see below), whose sum is σ = 56042376. Its totient is φ = 28021184.

The previous prime is 42031757. The next prime is 42031783. The reversal of 42031779 is 97713024.

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 42031779 - 2⁵ = 42031747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42031739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7005294 + ... + 7005299.

It is an arithmetic number, because the mean of its divisors is an integer number (14010594).

Almost surely, 2^42031779 is an apocalyptic number.

42031779 is a deficient number, since it is larger than the sum of its proper divisors (14010597).

42031779 is a wasteful number, since it uses less digits than its factorization.

42031779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14010596.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 42031779 is about 6483.1920378776. The cubic root of 42031779 is about 347.6903127440.

The spelling of 42031779 in words is "forty-two million, thirty-one thousand, seven hundred seventy-nine".