993998378 has 4 divisors (see below), whose sum is σ = 1490997570. Its totient is φ = 496999188.

The previous prime is 993998323. The next prime is 993998387. The reversal of 993998378 is 873899399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 807866929 + 186131449 = 28423^2 + 13643^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248499593 + ... + 248499596.

Almost surely, 2^993998378 is an apocalyptic number.

993998378 is a deficient number, since it is larger than the sum of its proper divisors (496999192).

993998378 is a wasteful number, since it uses less digits than its factorization.

993998378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496999191.

The product of its digits is 26453952, while the sum is 65.

The square root of 993998378 is about 31527.7398175004. The cubic root of 993998378 is about 997.9954437726.

The spelling of 993998378 in words is "nine hundred ninety-three million, nine hundred ninety-eight thousand, three hundred seventy-eight".