991029730 has 16 divisors (see below), whose sum is σ = 1785671424. Its totient is φ = 396007920.

The previous prime is 991029713. The next prime is 991029749. The reversal of 991029730 is 37920199.

991029730 is a modest number, since divided by 29730 gives 9910 as remainder.

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, 40092 + ... + 59911.

It is an arithmetic number, because the mean of its divisors is an integer number (111604464).

Almost surely, 2^991029730 is an apocalyptic number.

991029730 is a deficient number, since it is larger than the sum of its proper divisors (794641694).

991029730 is a wasteful number, since it uses less digits than its factorization.

991029730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101001.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 991029730 is about 31480.6246761401. The cubic root of 991029730 is about 997.0009245381. Note that the first 3 decimals are identical.

The spelling of 991029730 in words is "nine hundred ninety-one million, twenty-nine thousand, seven hundred thirty".