42840439049 has 2 divisors, whose sum is σ = 42840439050. Its totient is φ = 42840439048.

The previous prime is 42840439013. The next prime is 42840439099. The reversal of 42840439049 is 94093404824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28276776649 + 14563662400 = 168157^2 + 120680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42840439049 is a prime.

It is a super-2 number, since 2×42840439049² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42840438994 and 42840439012.

It is not a weakly prime, because it can be changed into another prime (42840439099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21420219524 + 21420219525.

It is an arithmetic number, because the mean of its divisors is an integer number (21420219525).

Almost surely, 2^42840439049 is an apocalyptic number.

It is an amenable number.

42840439049 is a deficient number, since it is larger than the sum of its proper divisors (1).

42840439049 is an equidigital number, since it uses as much as digits as its factorization.

42840439049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 42840439049 in words is "forty-two billion, eight hundred forty million, four hundred thirty-nine thousand, forty-nine".