821197395 has 24 divisors (see below), whose sum is σ = 1453697856. Its totient is φ = 428652288.

The previous prime is 821197381. The next prime is 821197397. The reversal of 821197395 is 593791128.

It is not a de Polignac number, because 821197395 - 2⁶ = 821197331 is a prime.

It is a super-3 number, since 3×821197395³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 821197395.

It is not an unprimeable number, because it can be changed into a prime (821197397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192022 + ... + 196251.

It is an arithmetic number, because the mean of its divisors is an integer number (60570744).

Almost surely, 2^821197395 is an apocalyptic number.

821197395 is a deficient number, since it is larger than the sum of its proper divisors (632500461).

821197395 is a wasteful number, since it uses less digits than its factorization.

821197395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388331 (or 388328 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 821197395 is about 28656.5419232677. The cubic root of 821197395 is about 936.4455301442.

The spelling of 821197395 in words is "eight hundred twenty-one million, one hundred ninety-seven thousand, three hundred ninety-five".