867809538 has 20 divisors (see below), whose sum is σ = 1944536550. Its totient is φ = 289269792.

The previous prime is 867809521. The next prime is 867809539. The reversal of 867809538 is 835908768.

It is a happy number.

867809538 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 only one way, i.e., 696801609 + 171007929 = 26397^2 + 13077^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (867809539) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2678263 + ... + 2678586.

Almost surely, 2^867809538 is an apocalyptic number.

867809538 is an abundant number, since it is smaller than the sum of its proper divisors (1076727012).

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

867809538 is a wasteful number, since it uses less digits than its factorization.

867809538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356863 (or 5356854 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 867809538 is about 29458.6071972183. The cubic root of 867809538 is about 953.8384086103.

The spelling of 867809538 in words is "eight hundred sixty-seven million, eight hundred nine thousand, five hundred thirty-eight".