42978245 has 8 divisors (see below), whose sum is σ = 53237760. Its totient is φ = 33273360.

The previous prime is 42978241. The next prime is 42978251. The reversal of 42978245 is 54287924.

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

It is not a de Polignac number, because 42978245 - 2² = 42978241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42978241) 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, 138485 + ... + 138794.

It is an arithmetic number, because the mean of its divisors is an integer number (6654720).

Almost surely, 2^42978245 is an apocalyptic number.

It is an amenable number.

42978245 is a deficient number, since it is larger than the sum of its proper divisors (10259515).

42978245 is a wasteful number, since it uses less digits than its factorization.

42978245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277315.

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

The square root of 42978245 is about 6555.7795112404. The cubic root of 42978245 is about 350.2807135721.

The spelling of 42978245 in words is "forty-two million, nine hundred seventy-eight thousand, two hundred forty-five".