196428991 has 8 divisors (see below), whose sum is σ = 219513168. Its totient is φ = 174216000.

The previous prime is 196428979. The next prime is 196429003. The reversal of 196428991 is 199824691.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (196428979) and next prime (196429003).

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 196428991 - 2⁵ = 196428959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196428961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217320 + ... + 218221.

It is an arithmetic number, because the mean of its divisors is an integer number (27439146).

Almost surely, 2^196428991 is an apocalyptic number.

196428991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

196428991 is a deficient number, since it is larger than the sum of its proper divisors (23084177).

196428991 is a wasteful number, since it uses less digits than its factorization.

196428991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435593.

The product of its digits is 279936, while the sum is 49.

The square root of 196428991 is about 14015.3127328647. The cubic root of 196428991 is about 581.3020599149.

The spelling of 196428991 in words is "one hundred ninety-six million, four hundred twenty-eight thousand, nine hundred ninety-one".