863942790 has 64 divisors (see below), whose sum is σ = 2170354176. Its totient is φ = 219681792.

The previous prime is 863942777. The next prime is 863942791. The reversal of 863942790 is 97249368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863942791) 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, 241797 + ... + 245343.

It is an arithmetic number, because the mean of its divisors is an integer number (33911784).

Almost surely, 2^863942790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863942790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085177088).

863942790 is an abundant number, since it is smaller than the sum of its proper divisors (1306411386).

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

863942790 is a wasteful number, since it uses less digits than its factorization.

863942790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 863942790 is about 29392.9037354257. The cubic root of 863942790 is about 952.4196086766.

The spelling of 863942790 in words is "eight hundred sixty-three million, nine hundred forty-two thousand, seven hundred ninety".