867861993 has 32 divisors (see below), whose sum is σ = 1240842240. Its totient is φ = 537969600.

The previous prime is 867861979. The next prime is 867861997. The reversal of 867861993 is 399168768.

It is not a de Polignac number, because 867861993 - 2⁴ = 867861977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (867861997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 730546 + ... + 731732.

It is an arithmetic number, because the mean of its divisors is an integer number (38776320).

Almost surely, 2^867861993 is an apocalyptic number.

It is an amenable number.

867861993 is a deficient number, since it is larger than the sum of its proper divisors (372980247).

867861993 is a wasteful number, since it uses less digits than its factorization.

867861993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437.

The product of its digits is 3919104, while the sum is 57.

The square root of 867861993 is about 29459.4975008061. The cubic root of 867861993 is about 953.8576265698.

The spelling of 867861993 in words is "eight hundred sixty-seven million, eight hundred sixty-one thousand, nine hundred ninety-three".