919991642 has 8 divisors (see below), whose sum is σ = 1382511936. Its totient is φ = 459154332.

The previous prime is 919991627. The next prime is 919991689. The reversal of 919991642 is 246199919.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419378 + ... + 421565.

It is an arithmetic number, because the mean of its divisors is an integer number (172813992).

Almost surely, 2^919991642 is an apocalyptic number.

919991642 is a deficient number, since it is larger than the sum of its proper divisors (462520294).

919991642 is a wasteful number, since it uses less digits than its factorization.

919991642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841492.

The product of its digits is 314928, while the sum is 50.

The square root of 919991642 is about 30331.3639983434. The cubic root of 919991642 is about 972.5858809573.

The spelling of 919991642 in words is "nine hundred nineteen million, nine hundred ninety-one thousand, six hundred forty-two".