42501839 has 2 divisors, whose sum is σ = 42501840. Its totient is φ = 42501838.

The previous prime is 42501827. The next prime is 42501847. The reversal of 42501839 is 93810524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42501839 - 2²⁴ = 25724623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42501869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21250919 + 21250920.

It is an arithmetic number, because the mean of its divisors is an integer number (21250920).

Almost surely, 2^42501839 is an apocalyptic number.

42501839 is a deficient number, since it is larger than the sum of its proper divisors (1).

42501839 is an equidigital number, since it uses as much as digits as its factorization.

42501839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 42501839 is about 6519.3434485384. The cubic root of 42501839 is about 348.9816357471.

The spelling of 42501839 in words is "forty-two million, five hundred one thousand, eight hundred thirty-nine".