42039967 has 2 divisors, whose sum is σ = 42039968. Its totient is φ = 42039966.

The previous prime is 42039953. The next prime is 42040007. The reversal of 42039967 is 76993024.

It is an a-pointer prime, because the next prime (42040007) can be obtained adding 42039967 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42039967 is a prime.

It is a super-2 number, since 2×42039967² = 3534717650722178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42039947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21019983 + 21019984.

It is an arithmetic number, because the mean of its divisors is an integer number (21019984).

Almost surely, 2^42039967 is an apocalyptic number.

42039967 is a deficient number, since it is larger than the sum of its proper divisors (1).

42039967 is an equidigital number, since it uses as much as digits as its factorization.

42039967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 42039967 is about 6483.8234861847. The cubic root of 42039967 is about 347.7128885466.

The spelling of 42039967 in words is "forty-two million, thirty-nine thousand, nine hundred sixty-seven".