42478831 has 2 divisors, whose sum is σ = 42478832. Its totient is φ = 42478830.

The previous prime is 42478771. The next prime is 42478837. The reversal of 42478831 is 13887424.

42478831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42478831 - 2⁷ = 42478703 is a prime.

It is a super-2 number, since 2×42478831² = 3608902166253122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42478837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21239415 + 21239416.

It is an arithmetic number, because the mean of its divisors is an integer number (21239416).

Almost surely, 2^42478831 is an apocalyptic number.

42478831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42478831 is an equidigital number, since it uses as much as digits as its factorization.

42478831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 42478831 is about 6517.5786147925. The cubic root of 42478831 is about 348.9186516585.

The spelling of 42478831 in words is "forty-two million, four hundred seventy-eight thousand, eight hundred thirty-one".