821007434 has 8 divisors (see below), whose sum is σ = 1326242820. Its totient is φ = 378926496.

The previous prime is 821007419. The next prime is 821007449. The reversal of 821007434 is 434700128.

821007434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (821007419) and next prime (821007449).

It can be written as a sum of positive squares in 2 ways, for example, as 814931209 + 6076225 = 28547^2 + 2465^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 821007397 and 821007406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15788579 + ... + 15788630.

Almost surely, 2^821007434 is an apocalyptic number.

821007434 is a deficient number, since it is larger than the sum of its proper divisors (505235386).

821007434 is a wasteful number, since it uses less digits than its factorization.

821007434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31577224.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 821007434 is about 28653.2272876896. The cubic root of 821007434 is about 936.3733177672.

The spelling of 821007434 in words is "eight hundred twenty-one million, seven thousand, four hundred thirty-four".