840761988 has 24 divisors (see below), whose sum is σ = 2140121760. Its totient is φ = 254776320.

The previous prime is 840761981. The next prime is 840761993. The reversal of 840761988 is 889167048.

It is a self number, because there is not a number n which added to its sum of digits gives 840761988.

It is not an unprimeable number, because it can be changed into a prime (840761981) 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, 3184573 + ... + 3184836.

It is an arithmetic number, because the mean of its divisors is an integer number (89171740).

Almost surely, 2^840761988 is an apocalyptic number.

It is an amenable number.

840761988 is an abundant number, since it is smaller than the sum of its proper divisors (1299359772).

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

840761988 is a wasteful number, since it uses less digits than its factorization.

840761988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369427 (or 6369425 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 840761988 is about 28995.8960544419. The cubic root of 840761988 is about 943.8240135044.

The spelling of 840761988 in words is "eight hundred forty million, seven hundred sixty-one thousand, nine hundred eighty-eight".