991398470 has 16 divisors (see below), whose sum is σ = 1785399840. Its totient is φ = 396363264.

The previous prime is 991398431. The next prime is 991398493. The reversal of 991398470 is 74893199.

991398470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2330 + ... + 44589.

It is an arithmetic number, because the mean of its divisors is an integer number (111587490).

Almost surely, 2^991398470 is an apocalyptic number.

991398470 is a deficient number, since it is larger than the sum of its proper divisors (794001370).

991398470 is a wasteful number, since it uses less digits than its factorization.

991398470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49039.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 991398470 is about 31486.4807496805. The cubic root of 991398470 is about 997.1245631209.

The spelling of 991398470 in words is "nine hundred ninety-one million, three hundred ninety-eight thousand, four hundred seventy".