42947979 has 4 divisors (see below), whose sum is σ = 57263976. Its totient is φ = 28631984.

The previous prime is 42947977. The next prime is 42947987. The reversal of 42947979 is 97974924.

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 42947979 - 2¹ = 42947977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42947977) 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, 7157994 + ... + 7157999.

It is an arithmetic number, because the mean of its divisors is an integer number (14315994).

Almost surely, 2^42947979 is an apocalyptic number.

42947979 is a deficient number, since it is larger than the sum of its proper divisors (14315997).

42947979 is a wasteful number, since it uses less digits than its factorization.

42947979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14315996.

The product of its digits is 1143072, while the sum is 51.

The square root of 42947979 is about 6553.4707598341. The cubic root of 42947979 is about 350.1984697481.

The spelling of 42947979 in words is "forty-two million, nine hundred forty-seven thousand, nine hundred seventy-nine".