998939386 has 4 divisors (see below), whose sum is σ = 1498409082. Its totient is φ = 499469692.

The previous prime is 998939377. The next prime is 998939387. The reversal of 998939386 is 683939899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 683939899 = 1583 ⋅432053.

It can be written as a sum of positive squares in only one way, i.e., 759278025 + 239661361 = 27555^2 + 15481^2 .

It is a super-3 number, since 3×998939386³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (998939387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249734845 + ... + 249734848.

Almost surely, 2^998939386 is an apocalyptic number.

998939386 is a deficient number, since it is larger than the sum of its proper divisors (499469696).

998939386 is a wasteful number, since it uses less digits than its factorization.

998939386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499469695.

The product of its digits is 22674816, while the sum is 64.

The square root of 998939386 is about 31606.0023729671. The cubic root of 998939386 is about 999.6463369372.

The spelling of 998939386 in words is "nine hundred ninety-eight million, nine hundred thirty-nine thousand, three hundred eighty-six".