42040829 has 2 divisors, whose sum is σ = 42040830. Its totient is φ = 42040828.

The previous prime is 42040777. The next prime is 42040837. The reversal of 42040829 is 92804024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39715204 + 2325625 = 6302^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 42040829 - 2²⁴ = 25263613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42040879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21020414 + 21020415.

It is an arithmetic number, because the mean of its divisors is an integer number (21020415).

Almost surely, 2^42040829 is an apocalyptic number.

It is an amenable number.

42040829 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040829 is an equidigital number, since it uses as much as digits as its factorization.

42040829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 42040829 is about 6483.8899589675. The cubic root of 42040829 is about 347.7152650665.

The spelling of 42040829 in words is "forty-two million, forty thousand, eight hundred twenty-nine".