840242537 has 4 divisors (see below), whose sum is σ = 840478080. Its totient is φ = 840006996.

The previous prime is 840242531. The next prime is 840242539. The reversal of 840242537 is 735242048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 840242537 - 2¹⁶ = 840177001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840242497 and 840242506.

It is not an unprimeable number, because it can be changed into a prime (840242531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112337 + ... + 119582.

It is an arithmetic number, because the mean of its divisors is an integer number (210119520).

Almost surely, 2^840242537 is an apocalyptic number.

It is an amenable number.

840242537 is a deficient number, since it is larger than the sum of its proper divisors (235543).

840242537 is a wasteful number, since it uses less digits than its factorization.

840242537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235542.

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 840242537 is about 28986.9373511587. The cubic root of 840242537 is about 943.6295980663.

The spelling of 840242537 in words is "eight hundred forty million, two hundred forty-two thousand, five hundred thirty-seven".