42978223 has 2 divisors, whose sum is σ = 42978224. Its totient is φ = 42978222.

The previous prime is 42978181. The next prime is 42978233. The reversal of 42978223 is 32287924.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42978223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42978233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21489111 + 21489112.

It is an arithmetic number, because the mean of its divisors is an integer number (21489112).

Almost surely, 2^42978223 is an apocalyptic number.

42978223 is a deficient number, since it is larger than the sum of its proper divisors (1).

42978223 is an equidigital number, since it uses as much as digits as its factorization.

42978223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 42978223 is about 6555.7778333314. Note that the first 3 decimals coincide. The cubic root of 42978223 is about 350.2806538041.

The spelling of 42978223 in words is "forty-two million, nine hundred seventy-eight thousand, two hundred twenty-three".