42139829 has 2 divisors, whose sum is σ = 42139830. Its totient is φ = 42139828.

The previous prime is 42139817. The next prime is 42139879. The reversal of 42139829 is 92893124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41899729 + 240100 = 6473^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 42139829 - 2¹⁶ = 42074293 is a prime.

It is a Chen prime.

It is equal to p_2555579 and since 42139829 and 2555579 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 42139792 and 42139801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42139879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21069914 + 21069915.

It is an arithmetic number, because the mean of its divisors is an integer number (21069915).

Almost surely, 2^42139829 is an apocalyptic number.

It is an amenable number.

42139829 is a deficient number, since it is larger than the sum of its proper divisors (1).

42139829 is an equidigital number, since it uses as much as digits as its factorization.

42139829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 42139829 is about 6491.5197758306. The cubic root of 42139829 is about 347.9879906236.

The spelling of 42139829 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred twenty-nine".