196921972 has 24 divisors (see below), whose sum is σ = 371508200. Its totient is φ = 90792576.

The previous prime is 196921961. The next prime is 196921973. The reversal of 196921972 is 279129691.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1089936 + 195832036 = 1044^2 + 13994^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196921973) 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, 85654 + ... + 87922.

Almost surely, 2^196921972 is an apocalyptic number.

It is an amenable number.

196921972 is a deficient number, since it is larger than the sum of its proper divisors (174586228).

196921972 is a wasteful number, since it uses less digits than its factorization.

196921972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3955 (or 3953 counting only the distinct ones).

The product of its digits is 122472, while the sum is 46.

The square root of 196921972 is about 14032.8889399154. Note that the first 3 decimals coincide. The cubic root of 196921972 is about 581.7879547004.

The spelling of 196921972 in words is "one hundred ninety-six million, nine hundred twenty-one thousand, nine hundred seventy-two".