991429430 has 32 divisors (see below), whose sum is σ = 1842531840. Its totient is φ = 383806080.

The previous prime is 991429429. The next prime is 991429463. The reversal of 991429430 is 34924199.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63656 + ... + 77684.

It is an arithmetic number, because the mean of its divisors is an integer number (57579120).

Almost surely, 2^991429430 is an apocalyptic number.

991429430 is a deficient number, since it is larger than the sum of its proper divisors (851102410).

991429430 is a wasteful number, since it uses less digits than its factorization.

991429430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14264.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 991429430 is about 31486.9723854168. The cubic root of 991429430 is about 997.1349426189.

The spelling of 991429430 in words is "nine hundred ninety-one million, four hundred twenty-nine thousand, four hundred thirty".