1921832947 has 8 divisors (see below), whose sum is σ = 2011017456. Its totient is φ = 1834608672.

The previous prime is 1921832839. The next prime is 1921832959. The reversal of 1921832947 is 7492381291.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921832947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1921832897 and 1921832906.

It is not an unprimeable number, because it can be changed into a prime (1921832147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 488053 + ... + 491974.

It is an arithmetic number, because the mean of its divisors is an integer number (251377182).

Almost surely, 2^1921832947 is an apocalyptic number.

1921832947 is a deficient number, since it is larger than the sum of its proper divisors (89184509).

1921832947 is an equidigital number, since it uses as much as digits as its factorization.

1921832947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980117.

The product of its digits is 217728, while the sum is 46.

The square root of 1921832947 is about 43838.7151613731. The cubic root of 1921832947 is about 1243.2883899561.

The spelling of 1921832947 in words is "one billion, nine hundred twenty-one million, eight hundred thirty-two thousand, nine hundred forty-seven".