368209921 has 16 divisors (see below), whose sum is σ = 392895360. Its totient is φ = 344950320.

The previous prime is 368209901. The next prime is 368209931. The reversal of 368209921 is 129902863.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-368209921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (368209901) 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, 644566 + ... + 645136.

It is an arithmetic number, because the mean of its divisors is an integer number (24555960).

Almost surely, 2^368209921 is an apocalyptic number.

It is an amenable number.

368209921 is a deficient number, since it is larger than the sum of its proper divisors (24685439).

368209921 is an frugal number, since it uses more digits than its factorization.

368209921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 368209921 is about 19188.7967574833. The cubic root of 368209921 is about 716.7458086267.

The spelling of 368209921 in words is "three hundred sixty-eight million, two hundred nine thousand, nine hundred twenty-one".