863388990 has 64 divisors (see below), whose sum is σ = 2306905920. Its totient is φ = 229783680.

The previous prime is 863388983. The next prime is 863388997. The reversal of 863388990 is 99883368.

It is an interprime number because it is at equal distance from previous prime (863388983) and next prime (863388997).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863388997) 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, 147520 + ... + 153260.

It is an arithmetic number, because the mean of its divisors is an integer number (36045405).

Almost surely, 2^863388990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863388990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153452960).

863388990 is an abundant number, since it is smaller than the sum of its proper divisors (1443516930).

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

863388990 is a wasteful number, since it uses less digits than its factorization.

863388990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6314 (or 6308 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 863388990 is about 29383.4815840465. The cubic root of 863388990 is about 952.2160601984.

The spelling of 863388990 in words is "eight hundred sixty-three million, three hundred eighty-eight thousand, nine hundred ninety".