978838906 has 4 divisors (see below), whose sum is σ = 1468258362. Its totient is φ = 489419452.

The previous prime is 978838897. The next prime is 978838933. The reversal of 978838906 is 609838879.

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., 976250025 + 2588881 = 31245^2 + 1609^2 .

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, 244709725 + ... + 244709728.

Almost surely, 2^978838906 is an apocalyptic number.

978838906 is a deficient number, since it is larger than the sum of its proper divisors (489419456).

978838906 is a wasteful number, since it uses less digits than its factorization.

978838906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489419455.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 978838906 is about 31286.4012951314. The cubic root of 978838906 is about 992.8959540387.

The spelling of 978838906 in words is "nine hundred seventy-eight million, eight hundred thirty-eight thousand, nine hundred six".