784948921 has 16 divisors (see below), whose sum is σ = 818579520. Its totient is φ = 752190400.

The previous prime is 784948909. The next prime is 784948937. The reversal of 784948921 is 129849487.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 784948921 - 2¹³ = 784940729 is a prime.

It is a super-2 number, since 2×784948921² = 1232289617158128482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (784948981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540246 + ... + 541696.

It is an arithmetic number, because the mean of its divisors is an integer number (51161220).

Almost surely, 2^784948921 is an apocalyptic number.

It is an amenable number.

784948921 is a deficient number, since it is larger than the sum of its proper divisors (33630599).

784948921 is a wasteful number, since it uses less digits than its factorization.

784948921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736.

The product of its digits is 1161216, while the sum is 52.

The square root of 784948921 is about 28016.9398935715. The cubic root of 784948921 is about 922.4591271124.

The spelling of 784948921 in words is "seven hundred eighty-four million, nine hundred forty-eight thousand, nine hundred twenty-one".