938921921 has 8 divisors (see below), whose sum is σ = 1073348544. Its totient is φ = 804569040.

The previous prime is 938921911. The next prime is 938921947. The reversal of 938921921 is 129129839.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 938921921 - 2⁶ = 938921857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (938921911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12266 + ... + 45036.

It is an arithmetic number, because the mean of its divisors is an integer number (134168568).

Almost surely, 2^938921921 is an apocalyptic number.

It is an amenable number.

938921921 is a deficient number, since it is larger than the sum of its proper divisors (134426623).

938921921 is a wasteful number, since it uses less digits than its factorization.

938921921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36871.

The product of its digits is 69984, while the sum is 44.

The square root of 938921921 is about 30641.8328596708. The cubic root of 938921921 is about 979.2114721186.

The spelling of 938921921 in words is "nine hundred thirty-eight million, nine hundred twenty-one thousand, nine hundred twenty-one".