42978141 has 8 divisors (see below), whose sum is σ = 63671360. Its totient is φ = 28652076.

The previous prime is 42978139. The next prime is 42978149. The reversal of 42978141 is 14187924.

It is not a de Polignac number, because 42978141 - 2¹ = 42978139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42978096 and 42978105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42978149) 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, 795865 + ... + 795918.

It is an arithmetic number, because the mean of its divisors is an integer number (7958920).

Almost surely, 2^42978141 is an apocalyptic number.

It is an amenable number.

42978141 is a deficient number, since it is larger than the sum of its proper divisors (20693219).

42978141 is a wasteful number, since it uses less digits than its factorization.

42978141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591792 (or 1591786 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 42978141 is about 6555.7715793032. The cubic root of 42978141 is about 350.2804310321.

The spelling of 42978141 in words is "forty-two million, nine hundred seventy-eight thousand, one hundred forty-one".