42978224 has 20 divisors (see below), whose sum is σ = 83826480. Its totient is φ = 21345600.

The previous prime is 42978223. The next prime is 42978233. The reversal of 42978224 is 42287924.

It is not an unprimeable number, because it can be changed into a prime (42978223) 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, 6479 + ... + 11310.

It is an arithmetic number, because the mean of its divisors is an integer number (4191324).

Almost surely, 2^42978224 is an apocalyptic number.

It is an amenable number.

42978224 is a deficient number, since it is larger than the sum of its proper divisors (40848256).

42978224 is a wasteful number, since it uses less digits than its factorization.

42978224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17948 (or 17942 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 42978224 is about 6555.7779096000. Note that the first 3 decimals coincide. The cubic root of 42978224 is about 350.2806565208.

It can be divided in two parts, 4297 and 8224, that added together give a palindrome (12521).

The spelling of 42978224 in words is "forty-two million, nine hundred seventy-eight thousand, two hundred twenty-four".