840840396 has 24 divisors (see below), whose sum is σ = 2140321344. Its totient is φ = 254800080.

The previous prime is 840840391. The next prime is 840840439. The reversal of 840840396 is 693048048.

It is not an unprimeable number, because it can be changed into a prime (840840391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3184870 + ... + 3185133.

It is an arithmetic number, because the mean of its divisors is an integer number (89180056).

Almost surely, 2^840840396 is an apocalyptic number.

It is an amenable number.

840840396 is an abundant number, since it is smaller than the sum of its proper divisors (1299480948).

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

840840396 is a wasteful number, since it uses less digits than its factorization.

840840396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6370021 (or 6370019 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 840840396 is about 28997.2480763261. The cubic root of 840840396 is about 943.8533523875.

The spelling of 840840396 in words is "eight hundred forty million, eight hundred forty thousand, three hundred ninety-six".