243948621 has 8 divisors (see below), whose sum is σ = 371731264. Its totient is φ = 139399200.

The previous prime is 243948583. The next prime is 243948629. The reversal of 243948621 is 126849342.

243948621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 243948621 - 2⁹ = 243948109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243948621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243948629) 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, 5808280 + ... + 5808321.

It is an arithmetic number, because the mean of its divisors is an integer number (46466408).

Almost surely, 2^243948621 is an apocalyptic number.

243948621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243948621 is a deficient number, since it is larger than the sum of its proper divisors (127782643).

243948621 is a wasteful number, since it uses less digits than its factorization.

243948621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11616611.

The product of its digits is 82944, while the sum is 39.

The square root of 243948621 is about 15618.8546635149. The cubic root of 243948621 is about 624.8361136164.

The spelling of 243948621 in words is "two hundred forty-three million, nine hundred forty-eight thousand, six hundred twenty-one".