163957 has 4 divisors (see below), whose sum is σ = 165376. Its totient is φ = 162540.

The previous prime is 163927. The next prime is 163973. The reversal of 163957 is 759361.

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 an emirpimes, since its reverse is a distinct semiprime: 759361 = 41 ⋅18521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163957 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 (163927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519 + ... + 772.

It is an arithmetic number, because the mean of its divisors is an integer number (41344).

2¹⁶³⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

163957 is a deficient number, since it is larger than the sum of its proper divisors (1419).

163957 is a wasteful number, since it uses less digits than its factorization.

163957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418.

The product of its digits is 5670, while the sum is 31.

The square root of 163957 is about 404.9160406800. The cubic root of 163957 is about 54.7322524018.

The spelling of 163957 in words is "one hundred sixty-three thousand, nine hundred fifty-seven".