42972845 has 8 divisors (see below), whose sum is σ = 51745176. Its totient is φ = 34259776.

The previous prime is 42972841. The next prime is 42972871. The reversal of 42972845 is 54827924.

It can be written as a sum of positive squares in 4 ways, for example, as 20666116 + 22306729 = 4546^2 + 4723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42972845 - 2² = 42972841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42972841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13202 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (6468147).

Almost surely, 2^42972845 is an apocalyptic number.

It is an amenable number.

42972845 is a deficient number, since it is larger than the sum of its proper divisors (8772331).

42972845 is a wasteful number, since it uses less digits than its factorization.

42972845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29631.

The product of its digits is 161280, while the sum is 41.

The square root of 42972845 is about 6555.3676479661. The cubic root of 42972845 is about 350.2660426219.

The spelling of 42972845 in words is "forty-two million, nine hundred seventy-two thousand, eight hundred forty-five".