42400123049 has 2 divisors, whose sum is σ = 42400123050. Its totient is φ = 42400123048.

The previous prime is 42400123021. The next prime is 42400123159. The reversal of 42400123049 is 94032100424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33584227600 + 8815895449 = 183260^2 + 93893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42400123049 is a prime.

It is not a weakly prime, because it can be changed into another prime (42400125049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200061524 + 21200061525.

It is an arithmetic number, because the mean of its divisors is an integer number (21200061525).

Almost surely, 2^42400123049 is an apocalyptic number.

It is an amenable number.

42400123049 is a deficient number, since it is larger than the sum of its proper divisors (1).

42400123049 is an equidigital number, since it uses as much as digits as its factorization.

42400123049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 42400123049 in words is "forty-two billion, four hundred million, one hundred twenty-three thousand, forty-nine".