867941840 has 20 divisors (see below), whose sum is σ = 2017964964. Its totient is φ = 347176704.

The previous prime is 867941839. The next prime is 867941849. The reversal of 867941840 is 48149768.

It can be written as a sum of positive squares in 2 ways, for example, as 514200976 + 353740864 = 22676^2 + 18808^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867941849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5424557 + ... + 5424716.

Almost surely, 2^867941840 is an apocalyptic number.

867941840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

867941840 is an abundant number, since it is smaller than the sum of its proper divisors (1150023124).

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

867941840 is a wasteful number, since it uses less digits than its factorization.

867941840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849286 (or 10849280 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 867941840 is about 29460.8526692626. The cubic root of 867941840 is about 953.8868786609.

The spelling of 867941840 in words is "eight hundred sixty-seven million, nine hundred forty-one thousand, eight hundred forty".