209738464 has 36 divisors (see below), whose sum is σ = 447140736. Its totient is φ = 96799872.

The previous prime is 209738429. The next prime is 209738491. The reversal of 209738464 is 464837902.

It is a self number, because there is not a number n which added to its sum of digits gives 209738464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13984 + ... + 24799.

It is an arithmetic number, because the mean of its divisors is an integer number (12420576).

Almost surely, 2^209738464 is an apocalyptic number.

It is an amenable number.

209738464 is an abundant number, since it is smaller than the sum of its proper divisors (237402272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209738464 is a wasteful number, since it uses less digits than its factorization.

209738464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38819 (or 38798 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 209738464 is about 14482.3500855352. The cubic root of 209738464 is about 594.1453388685.

The spelling of 209738464 in words is "two hundred nine million, seven hundred thirty-eight thousand, four hundred sixty-four".