194736939493 has 4 divisors (see below), whose sum is σ = 194750114860. Its totient is φ = 194723764128.

The previous prime is 194736939469. The next prime is 194736939497. The reversal of 194736939493 is 394939637491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394939637491 = 7 ⋅56419948213.

It can be written as a sum of positive squares in 2 ways, for example, as 145757495524 + 48979443969 = 381782^2 + 221313^2 .

It is a cyclic number.

It is not a de Polignac number, because 194736939493 - 2¹⁷ = 194736808421 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 (194736939497) 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, 6565488 + ... + 6595081.

It is an arithmetic number, because the mean of its divisors is an integer number (48687528715).

Almost surely, 2^194736939493 is an apocalyptic number.

It is an amenable number.

194736939493 is a deficient number, since it is larger than the sum of its proper divisors (13175367).

194736939493 is a wasteful number, since it uses less digits than its factorization.

194736939493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13175366.

The product of its digits is 119042784, while the sum is 67.

The spelling of 194736939493 in words is "one hundred ninety-four billion, seven hundred thirty-six million, nine hundred thirty-nine thousand, four hundred ninety-three".