42809973 has 4 divisors (see below), whose sum is σ = 57079968. Its totient is φ = 28539980.

The previous prime is 42809971. The next prime is 42809981. The reversal of 42809973 is 37990824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42809973 - 2¹ = 42809971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42809971) 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, 7134993 + ... + 7134998.

It is an arithmetic number, because the mean of its divisors is an integer number (14269992).

Almost surely, 2^42809973 is an apocalyptic number.

It is an amenable number.

42809973 is a deficient number, since it is larger than the sum of its proper divisors (14269995).

42809973 is a wasteful number, since it uses less digits than its factorization.

42809973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14269994.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 42809973 is about 6542.9330578877. The cubic root of 42809973 is about 349.8229662518.

The spelling of 42809973 in words is "forty-two million, eight hundred nine thousand, nine hundred seventy-three".