209960428 has 12 divisors (see below), whose sum is σ = 367596432. Its totient is φ = 104932880.

The previous prime is 209960423. The next prime is 209960437. The reversal of 209960428 is 824069902.

209960428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (209960423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688 + ... + 20503.

It is an arithmetic number, because the mean of its divisors is an integer number (30633036).

Almost surely, 2^209960428 is an apocalyptic number.

It is an amenable number.

209960428 is a deficient number, since it is larger than the sum of its proper divisors (157636004).

209960428 is a wasteful number, since it uses less digits than its factorization.

209960428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23672 (or 23670 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 209960428 is about 14490.0113181460. The cubic root of 209960428 is about 594.3548575532.

The spelling of 209960428 in words is "two hundred nine million, nine hundred sixty thousand, four hundred twenty-eight".