243957 has 8 divisors (see below), whose sum is σ = 371776. Its totient is φ = 139392.

The previous prime is 243953. The next prime is 243973. The reversal of 243957 is 759342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243957 - 2² = 243953 is a prime.

It is a Duffinian number.

243957 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243953) 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, 5788 + ... + 5829.

It is an arithmetic number, because the mean of its divisors is an integer number (46472).

2²⁴³⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

243957 is a deficient number, since it is larger than the sum of its proper divisors (127819).

243957 is a wasteful number, since it uses less digits than its factorization.

243957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11627.

The product of its digits is 7560, while the sum is 30.

The square root of 243957 is about 493.9200340136. The cubic root of 243957 is about 62.4843267366.

The spelling of 243957 in words is "two hundred forty-three thousand, nine hundred fifty-seven".