1921930994 has 16 divisors (see below), whose sum is σ = 2977710336. Its totient is φ = 929398800.

The previous prime is 1921930981. The next prime is 1921931029. The reversal of 1921930994 is 4990391291.

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 7 ways as a sum of consecutive naturals, for example, 103724 + ... + 120840.

It is an arithmetic number, because the mean of its divisors is an integer number (186106896).

Almost surely, 2^1921930994 is an apocalyptic number.

1921930994 is a deficient number, since it is larger than the sum of its proper divisors (1055779342).

1921930994 is a wasteful number, since it uses less digits than its factorization.

1921930994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18961.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 1921930994 is about 43839.8334166543. The cubic root of 1921930994 is about 1243.3095327274.

The spelling of 1921930994 in words is "one billion, nine hundred twenty-one million, nine hundred thirty thousand, nine hundred ninety-four".