991900942 has 8 divisors (see below), whose sum is σ = 1498555800. Its totient is φ = 492382344.

The previous prime is 991900939. The next prime is 991900993. The reversal of 991900942 is 249009199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1783717 + ... + 1784272.

It is an arithmetic number, because the mean of its divisors is an integer number (187319475).

Almost surely, 2^991900942 is an apocalyptic number.

991900942 is a deficient number, since it is larger than the sum of its proper divisors (506654858).

991900942 is a wasteful number, since it uses less digits than its factorization.

991900942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3568130.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 991900942 is about 31494.4589094653. The cubic root of 991900942 is about 997.2929927238.

The spelling of 991900942 in words is "nine hundred ninety-one million, nine hundred thousand, nine hundred forty-two".