840489405 has 48 divisors (see below), whose sum is σ = 1574907264. Its totient is φ = 381628800.

The previous prime is 840489379. The next prime is 840489431. The reversal of 840489405 is 504984048.

It is an interprime number because it is at equal distance from previous prime (840489379) and next prime (840489431).

It is not a de Polignac number, because 840489405 - 2⁷ = 840489277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107199 + ... + 114771.

It is an arithmetic number, because the mean of its divisors is an integer number (32810568).

Almost surely, 2^840489405 is an apocalyptic number.

It is an amenable number.

840489405 is a deficient number, since it is larger than the sum of its proper divisors (734417859).

840489405 is a wasteful number, since it uses less digits than its factorization.

840489405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7746 (or 7739 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 840489405 is about 28991.1953013324. The cubic root of 840489405 is about 943.7220035845.

The spelling of 840489405 in words is "eight hundred forty million, four hundred eighty-nine thousand, four hundred five".