243428949 has 16 divisors (see below), whose sum is σ = 361112640. Its totient is φ = 162071280.

The previous prime is 243428921. The next prime is 243428951. The reversal of 243428949 is 949824342.

It is a happy number.

243428949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243428949 - 2⁷ = 243428821 is a prime.

It is a super-2 number, since 2×243428949² = 118515306422489202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243428989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16339 + ... + 27455.

It is an arithmetic number, because the mean of its divisors is an integer number (22569540).

Almost surely, 2^243428949 is an apocalyptic number.

It is an amenable number.

243428949 is a deficient number, since it is larger than the sum of its proper divisors (117683691).

243428949 is a wasteful number, since it uses less digits than its factorization.

243428949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11937 (or 11931 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 243428949 is about 15602.2097473403. The cubic root of 243428949 is about 624.3921120940.

The spelling of 243428949 in words is "two hundred forty-three million, four hundred twenty-eight thousand, nine hundred forty-nine".