1020823638 has 8 divisors (see below), whose sum is σ = 2041647288. Its totient is φ = 340274544.

The previous prime is 1020823637. The next prime is 1020823649. The reversal of 1020823638 is 8363280201.

It is a sphenic number, since it is the product of 3 distinct primes.

1020823638 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1020823599 and 1020823608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020823631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85068631 + ... + 85068642.

It is an arithmetic number, because the mean of its divisors is an integer number (255205911).

Almost surely, 2^1020823638 is an apocalyptic number.

1020823638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1020823638 is a wasteful number, since it uses less digits than its factorization.

1020823638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170137278.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1020823638 is about 31950.3307964096. The cubic root of 1020823638 is about 1006.8935819962.

The spelling of 1020823638 in words is "one billion, twenty million, eight hundred twenty-three thousand, six hundred thirty-eight".