42402071 has 2 divisors, whose sum is σ = 42402072. Its totient is φ = 42402070.

The previous prime is 42402049. The next prime is 42402103. The reversal of 42402071 is 17020424.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42402071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42402001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201035 + 21201036.

It is an arithmetic number, because the mean of its divisors is an integer number (21201036).

Almost surely, 2^42402071 is an apocalyptic number.

42402071 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402071 is an equidigital number, since it uses as much as digits as its factorization.

42402071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 42402071 is about 6511.6872621464. The cubic root of 42402071 is about 348.7083575446.

Adding to 42402071 its reverse (17020424), we get a palindrome (59422495).

The spelling of 42402071 in words is "forty-two million, four hundred two thousand, seventy-one".