42923971 has 2 divisors, whose sum is σ = 42923972. Its totient is φ = 42923970.

The previous prime is 42923887. The next prime is 42923977. The reversal of 42923971 is 17932924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42923971 - 2¹³ = 42915779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42923971.

It is not a weakly prime, because it can be changed into another prime (42923977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21461985 + 21461986.

It is an arithmetic number, because the mean of its divisors is an integer number (21461986).

Almost surely, 2^42923971 is an apocalyptic number.

42923971 is a deficient number, since it is larger than the sum of its proper divisors (1).

42923971 is an equidigital number, since it uses as much as digits as its factorization.

42923971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 42923971 is about 6551.6388026203. The cubic root of 42923971 is about 350.1332037204.

The spelling of 42923971 in words is "forty-two million, nine hundred twenty-three thousand, nine hundred seventy-one".