993673138 has 4 divisors (see below), whose sum is σ = 1490509710. Its totient is φ = 496836568.

The previous prime is 993673129. The next prime is 993673151. The reversal of 993673138 is 831376399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831376399 = 7 ⋅118768057.

It can be written as a sum of positive squares in only one way, i.e., 575184289 + 418488849 = 23983^2 + 20457^2 .

It is a junction number, because it is equal to n+sod(n) for n = 993673091 and 993673100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248418283 + ... + 248418286.

Almost surely, 2^993673138 is an apocalyptic number.

993673138 is a deficient number, since it is larger than the sum of its proper divisors (496836572).

993673138 is a wasteful number, since it uses less digits than its factorization.

993673138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496836571.

The product of its digits is 734832, while the sum is 49.

The square root of 993673138 is about 31522.5813981025. The cubic root of 993673138 is about 997.8865826135.

The spelling of 993673138 in words is "nine hundred ninety-three million, six hundred seventy-three thousand, one hundred thirty-eight".