394836638493 has 8 divisors (see below), whose sum is σ = 574307837856. Its totient is φ = 239294932400.

The previous prime is 394836638459. The next prime is 394836638551.

394836638493 is nontrivially palindromic in base 10.

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 394836638493 - 2⁸ = 394836638237 is a prime.

It is a super-2 number, since 2×394836638493² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394836638453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5982373278 + ... + 5982373343.

It is an arithmetic number, because the mean of its divisors is an integer number (71788479732).

Almost surely, 2^394836638493 is an apocalyptic number.

394836638493 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

394836638493 is a deficient number, since it is larger than the sum of its proper divisors (179471199363).

394836638493 is a wasteful number, since it uses less digits than its factorization.

394836638493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11964746635.

The product of its digits is 241864704, while the sum is 66.

The spelling of 394836638493 in words is "three hundred ninety-four billion, eight hundred thirty-six million, six hundred thirty-eight thousand, four hundred ninety-three".