1994823638 has 8 divisors (see below), whose sum is σ = 3095416080. Its totient is φ = 963018280.

The previous prime is 1994823599. The next prime is 1994823643. The reversal of 1994823638 is 8363284991.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1994823638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17196698 + ... + 17196813.

It is an arithmetic number, because the mean of its divisors is an integer number (386927010).

Almost surely, 2^1994823638 is an apocalyptic number.

1994823638 is a deficient number, since it is larger than the sum of its proper divisors (1100592442).

1994823638 is a wasteful number, since it uses less digits than its factorization.

1994823638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34393542.

The product of its digits is 2239488, while the sum is 53.

The square root of 1994823638 is about 44663.4485681525. The cubic root of 1994823638 is about 1258.8331428800.

The spelling of 1994823638 in words is "one billion, nine hundred ninety-four million, eight hundred twenty-three thousand, six hundred thirty-eight".