1196398921 has 3 divisors (see below), whose sum is σ = 1196433511. Its totient is φ = 1196364332.

The previous prime is 1196398891. The next prime is 1196398939. The reversal of 1196398921 is 1298936911.

The square root of 1196398921 is 34589.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1298936911 = 37 ⋅35106403.

It can be written as a sum of positive squares in only one way, i.e., 622521 + 1195776400 = 789^2 + 34580^2 .

It is not a de Polignac number, because 1196398921 - 2⁷ = 1196398793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1196398961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17295 + ... + 51883.

Almost surely, 2^1196398921 is an apocalyptic number.

1196398921 is the 34589-th square number.

1196398921 is the 17295-th centered octagonal number.

It is an amenable number.

1196398921 is a deficient number, since it is larger than the sum of its proper divisors (34590).

1196398921 is an frugal number, since it uses more digits than its factorization.

1196398921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69178 (or 34589 counting only the distinct ones).

The product of its digits is 209952, while the sum is 49.

The cubic root of 1196398921 is about 1061.5945270391.

Multiplying 1196398921 by its sum of digits (49), we get a square (58623547129 = 242123²).

The spelling of 1196398921 in words is "one billion, one hundred ninety-six million, three hundred ninety-eight thousand, nine hundred twenty-one".