1921130394 has 16 divisors (see below), whose sum is σ = 4044485280. Its totient is φ = 606672720.

The previous prime is 1921130389. The next prime is 1921130437. The reversal of 1921130394 is 4930311291.

It is a happy number.

It is a Curzon number.

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, 8425897 + ... + 8426124.

It is an arithmetic number, because the mean of its divisors is an integer number (252780330).

Almost surely, 2^1921130394 is an apocalyptic number.

1921130394 is an abundant number, since it is smaller than the sum of its proper divisors (2123354886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921130394 is a wasteful number, since it uses less digits than its factorization.

1921130394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16852045.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 1921130394 is about 43830.7015002042. The cubic root of 1921130394 is about 1243.1368709859.

The spelling of 1921130394 in words is "one billion, nine hundred twenty-one million, one hundred thirty thousand, three hundred ninety-four".