42391003 has 2 divisors, whose sum is σ = 42391004. Its totient is φ = 42391002.

The previous prime is 42390983. The next prime is 42391057. The reversal of 42391003 is 30019324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42391003 - 2²⁵ = 8836571 is a prime.

It is not a weakly prime, because it can be changed into another prime (42391073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21195501 + 21195502.

It is an arithmetic number, because the mean of its divisors is an integer number (21195502).

Almost surely, 2^42391003 is an apocalyptic number.

42391003 is a deficient number, since it is larger than the sum of its proper divisors (1).

42391003 is an equidigital number, since it uses as much as digits as its factorization.

42391003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 42391003 is about 6510.8373501417. The cubic root of 42391003 is about 348.6780143730.

The spelling of 42391003 in words is "forty-two million, three hundred ninety-one thousand, three".