193974813 has 12 divisors (see below), whose sum is σ = 287020188. Its totient is φ = 126162240.

The previous prime is 193974787. The next prime is 193974817. The reversal of 193974813 is 318479391.

It can be written as a sum of positive squares in 2 ways, for example, as 3617604 + 190357209 = 1902^2 + 13797^2 .

It is not a de Polignac number, because 193974813 - 2⁶ = 193974749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193974817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262470 + ... + 263207.

It is an arithmetic number, because the mean of its divisors is an integer number (23918349).

Almost surely, 2^193974813 is an apocalyptic number.

It is an amenable number.

193974813 is a deficient number, since it is larger than the sum of its proper divisors (93045375).

193974813 is a wasteful number, since it uses less digits than its factorization.

193974813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525724 (or 525721 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 193974813 is about 13927.4840872284. The cubic root of 193974813 is about 578.8709834510.

The spelling of 193974813 in words is "one hundred ninety-three million, nine hundred seventy-four thousand, eight hundred thirteen".