863091138 has 32 divisors (see below), whose sum is σ = 2124533376. Its totient is φ = 227628288.

The previous prime is 863091137. The next prime is 863091197. The reversal of 863091138 is 831190368.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 863091096 and 863091105.

It is not an unprimeable number, because it can be changed into a prime (863091133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 789831 + ... + 790922.

It is an arithmetic number, because the mean of its divisors is an integer number (66391668).

Almost surely, 2^863091138 is an apocalyptic number.

863091138 is an abundant number, since it is smaller than the sum of its proper divisors (1261442238).

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

863091138 is a wasteful number, since it uses less digits than its factorization.

863091138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580778.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 863091138 is about 29378.4127889850. The cubic root of 863091138 is about 952.1065490812.

The spelling of 863091138 in words is "eight hundred sixty-three million, ninety-one thousand, one hundred thirty-eight".