8397806421 has 8 divisors (see below), whose sum is σ = 11855726784. Its totient is φ = 5269211840.

The previous prime is 8397806419. The next prime is 8397806479. The reversal of 8397806421 is 1246087938.

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

It is a cyclic number.

It is not a de Polignac number, because 8397806421 - 2¹ = 8397806419 is a prime.

It is a super-3 number, since 3×8397806421³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8397806321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82331385 + ... + 82331486.

It is an arithmetic number, because the mean of its divisors is an integer number (1481965848).

Almost surely, 2^8397806421 is an apocalyptic number.

It is an amenable number.

8397806421 is a deficient number, since it is larger than the sum of its proper divisors (3457920363).

8397806421 is a wasteful number, since it uses less digits than its factorization.

8397806421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164662891.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 8397806421 is about 91639.5461632149. The cubic root of 8397806421 is about 2032.6157501530.

The spelling of 8397806421 in words is "eight billion, three hundred ninety-seven million, eight hundred six thousand, four hundred twenty-one".