42387913 has 2 divisors, whose sum is σ = 42387914. Its totient is φ = 42387912.

The previous prime is 42387883. The next prime is 42387949. The reversal of 42387913 is 31978324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27123264 + 15264649 = 5208^2 + 3907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42387913 is a prime.

It is not a weakly prime, because it can be changed into another prime (42387713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21193956 + 21193957.

It is an arithmetic number, because the mean of its divisors is an integer number (21193957).

Almost surely, 2^42387913 is an apocalyptic number.

It is an amenable number.

42387913 is a deficient number, since it is larger than the sum of its proper divisors (1).

42387913 is an equidigital number, since it uses as much as digits as its factorization.

42387913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 42387913 is about 6510.6000491506. The cubic root of 42387913 is about 348.6695421252.

The spelling of 42387913 in words is "forty-two million, three hundred eighty-seven thousand, nine hundred thirteen".