209465428 has 12 divisors (see below), whose sum is σ = 368760672. Its totient is φ = 104105240.

The previous prime is 209465423. The next prime is 209465453. The reversal of 209465428 is 824564902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209465423) 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, 156118 + ... + 157453.

It is an arithmetic number, because the mean of its divisors is an integer number (30730056).

Almost surely, 2^209465428 is an apocalyptic number.

It is an amenable number.

209465428 is a deficient number, since it is larger than the sum of its proper divisors (159295244).

209465428 is a wasteful number, since it uses less digits than its factorization.

209465428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313742 (or 313740 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 209465428 is about 14472.9205069329. The cubic root of 209465428 is about 593.8874088920.

The spelling of 209465428 in words is "two hundred nine million, four hundred sixty-five thousand, four hundred twenty-eight".