42431947 has 2 divisors, whose sum is σ = 42431948. Its totient is φ = 42431946.

The previous prime is 42431923. The next prime is 42431951. The reversal of 42431947 is 74913424.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42431947 - 2⁷ = 42431819 is a prime.

It is not a weakly prime, because it can be changed into another prime (42431957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21215973 + 21215974.

It is an arithmetic number, because the mean of its divisors is an integer number (21215974).

Almost surely, 2^42431947 is an apocalyptic number.

42431947 is a deficient number, since it is larger than the sum of its proper divisors (1).

42431947 is an equidigital number, since it uses as much as digits as its factorization.

42431947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 42431947 is about 6513.9808872916. The cubic root of 42431947 is about 348.7902369183.

The spelling of 42431947 in words is "forty-two million, four hundred thirty-one thousand, nine hundred forty-seven".