209893893957 has 48 divisors (see below), whose sum is σ = 337884348672. Its totient is φ = 124463016960.

The previous prime is 209893893941. The next prime is 209893893959. The reversal of 209893893957 is 759398398902.

209893893957 is a `hidden beast` number, since 209 + 8 + 9 + 389 + 39 + 5 + 7 = 666.

It is not a de Polignac number, because 209893893957 - 2⁴ = 209893893941 is a prime.

It is a super-2 number, since 2×209893893957² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209893893959) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22967293 + ... + 22976429.

It is an arithmetic number, because the mean of its divisors is an integer number (7039257264).

Almost surely, 2^209893893957 is an apocalyptic number.

It is an amenable number.

209893893957 is a deficient number, since it is larger than the sum of its proper divisors (127990454715).

209893893957 is a wasteful number, since it uses less digits than its factorization.

209893893957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14138 (or 14135 counting only the distinct ones).

The product of its (nonzero) digits is 264539520, while the sum is 72.

The spelling of 209893893957 in words is "two hundred nine billion, eight hundred ninety-three million, eight hundred ninety-three thousand, nine hundred fifty-seven".