830678021 has 4 divisors (see below), whose sum is σ = 879541452. Its totient is φ = 781814592.

The previous prime is 830677997. The next prime is 830678137. The reversal of 830678021 is 120876038.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120876038 = 2 ⋅60438019.

It can be written as a sum of positive squares in 2 ways, for example, as 762532996 + 68145025 = 27614^2 + 8255^2 .

It is a cyclic number.

It is not a de Polignac number, because 830678021 - 2¹⁰ = 830676997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (830678521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24431690 + ... + 24431723.

It is an arithmetic number, because the mean of its divisors is an integer number (219885363).

Almost surely, 2^830678021 is an apocalyptic number.

It is an amenable number.

830678021 is a deficient number, since it is larger than the sum of its proper divisors (48863431).

830678021 is a wasteful number, since it uses less digits than its factorization.

830678021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48863430.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 830678021 is about 28821.4854058565. The cubic root of 830678021 is about 940.0354675768.

The spelling of 830678021 in words is "eight hundred thirty million, six hundred seventy-eight thousand, twenty-one".