42978943 has 4 divisors (see below), whose sum is σ = 49118800. Its totient is φ = 36839088.

The previous prime is 42978917. The next prime is 42978961. The reversal of 42978943 is 34987924.

It is a happy number.

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 42978943 - 2²¹ = 40881791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42978893 and 42978902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42978983) 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, 3069918 + ... + 3069931.

It is an arithmetic number, because the mean of its divisors is an integer number (12279700).

Almost surely, 2^42978943 is an apocalyptic number.

42978943 is a deficient number, since it is larger than the sum of its proper divisors (6139857).

42978943 is an equidigital number, since it uses as much as digits as its factorization.

42978943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6139856.

The product of its digits is 435456, while the sum is 46.

The square root of 42978943 is about 6555.8327464938. The cubic root of 42978943 is about 350.2826098386.

The spelling of 42978943 in words is "forty-two million, nine hundred seventy-eight thousand, nine hundred forty-three".