8197931406 has 64 divisors (see below), whose sum is σ = 19754219520. Its totient is φ = 2215628640.

The previous prime is 8197931393. The next prime is 8197931447. The reversal of 8197931406 is 6041397918.

It is a happy number.

It is a super-2 number, since 2×8197931406² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 543985 + ... + 558851.

It is an arithmetic number, because the mean of its divisors is an integer number (308659680).

Almost surely, 2^8197931406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8197931406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9877109760).

8197931406 is an abundant number, since it is smaller than the sum of its proper divisors (11556288114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8197931406 is a wasteful number, since it uses less digits than its factorization.

8197931406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15589.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 8197931406 is about 90542.4287613271. The cubic root of 8197931406 is about 2016.3600926163.

The spelling of 8197931406 in words is "eight billion, one hundred ninety-seven million, nine hundred thirty-one thousand, four hundred six".