193640897 has 4 divisors (see below), whose sum is σ = 205031556. Its totient is φ = 182250240.

The previous prime is 193640879. The next prime is 193640971. The reversal of 193640897 is 798046391.

193640897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798046391 = 23197 ⋅34403.

It can be written as a sum of positive squares in 2 ways, for example, as 182142016 + 11498881 = 13496^2 + 3391^2 .

It is a cyclic number.

It is not a de Polignac number, because 193640897 - 2¹² = 193636801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193640857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5695304 + ... + 5695337.

It is an arithmetic number, because the mean of its divisors is an integer number (51257889).

Almost surely, 2^193640897 is an apocalyptic number.

193640897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

193640897 is a deficient number, since it is larger than the sum of its proper divisors (11390659).

193640897 is a wasteful number, since it uses less digits than its factorization.

193640897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11390658.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 193640897 is about 13915.4912597436. The cubic root of 193640897 is about 578.5386287820.

The spelling of 193640897 in words is "one hundred ninety-three million, six hundred forty thousand, eight hundred ninety-seven".