840747988 has 12 divisors (see below), whose sum is σ = 1557856692. Its totient is φ = 395646080.

The previous prime is 840747983. The next prime is 840748037. The reversal of 840747988 is 889747048.

840747988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 347375044 + 493372944 = 18638^2 + 22212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840747983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6181903 + ... + 6182038.

It is an arithmetic number, because the mean of its divisors is an integer number (129821391).

Almost surely, 2^840747988 is an apocalyptic number.

It is an amenable number.

840747988 is a deficient number, since it is larger than the sum of its proper divisors (717108704).

840747988 is a wasteful number, since it uses less digits than its factorization.

840747988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12363962 (or 12363960 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 55.

The square root of 840747988 is about 28995.6546399629. The cubic root of 840747988 is about 943.8187747608.

The spelling of 840747988 in words is "eight hundred forty million, seven hundred forty-seven thousand, nine hundred eighty-eight".