921695990 has 16 divisors (see below), whose sum is σ = 1699518240. Its totient is φ = 359686080.

The previous prime is 921695989. The next prime is 921696007. The reversal of 921695990 is 99596129.

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 (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1123610 + ... + 1124429.

It is an arithmetic number, because the mean of its divisors is an integer number (106219890).

Almost surely, 2^921695990 is an apocalyptic number.

921695990 is a deficient number, since it is larger than the sum of its proper divisors (777822250).

921695990 is a wasteful number, since it uses less digits than its factorization.

921695990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248087.

The product of its (nonzero) digits is 393660, while the sum is 50.

The square root of 921695990 is about 30359.4464705798. The cubic root of 921695990 is about 973.1861046101.

The spelling of 921695990 in words is "nine hundred twenty-one million, six hundred ninety-five thousand, nine hundred ninety".