42398739623 has 2 divisors, whose sum is σ = 42398739624. Its totient is φ = 42398739622.

The previous prime is 42398739613. The next prime is 42398739659. The reversal of 42398739623 is 32693789324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42398739623 - 2⁸ = 42398739367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42398739613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21199369811 + 21199369812.

It is an arithmetic number, because the mean of its divisors is an integer number (21199369812).

Almost surely, 2^42398739623 is an apocalyptic number.

42398739623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42398739623 is an equidigital number, since it uses as much as digits as its factorization.

42398739623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 56.

The spelling of 42398739623 in words is "forty-two billion, three hundred ninety-eight million, seven hundred thirty-nine thousand, six hundred twenty-three".