193894913 has 4 divisors (see below), whose sum is σ = 193923120. Its totient is φ = 193866708.

The previous prime is 193894907. The next prime is 193894919. The reversal of 193894913 is 319498391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 319498391 = 17 ⋅18794023.

It is an interprime number because it is at equal distance from previous prime (193894907) and next prime (193894919).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193894913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193894919) 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, 3698 + ... + 20036.

It is an arithmetic number, because the mean of its divisors is an integer number (48480780).

Almost surely, 2^193894913 is an apocalyptic number.

It is an amenable number.

193894913 is a deficient number, since it is larger than the sum of its proper divisors (28207).

193894913 is a wasteful number, since it uses less digits than its factorization.

193894913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28206.

The product of its digits is 209952, while the sum is 47.

The square root of 193894913 is about 13924.6153627308. The cubic root of 193894913 is about 578.7914917843.

The spelling of 193894913 in words is "one hundred ninety-three million, eight hundred ninety-four thousand, nine hundred thirteen".