840424816 has 160 divisors (see below), whose sum is σ = 2112293376. Its totient is φ = 314496000.

The previous prime is 840424757. The next prime is 840424829. The reversal of 840424816 is 618424048.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3982951 + ... + 3983161.

Almost surely, 2^840424816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840424816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056146688).

840424816 is an abundant number, since it is smaller than the sum of its proper divisors (1271868560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840424816 is a wasteful number, since it uses less digits than its factorization.

840424816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 37.

The square root of 840424816 is about 28990.0813382784. The cubic root of 840424816 is about 943.6978289304.

The spelling of 840424816 in words is "eight hundred forty million, four hundred twenty-four thousand, eight hundred sixteen".