921938939 has 2 divisors, whose sum is σ = 921938940. Its totient is φ = 921938938.

The previous prime is 921938911. The next prime is 921939001. The reversal of 921938939 is 939839129.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921938939 is a prime.

It is not a weakly prime, because it can be changed into another prime (921938909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460969469 + 460969470.

It is an arithmetic number, because the mean of its divisors is an integer number (460969470).

Almost surely, 2^921938939 is an apocalyptic number.

921938939 is a deficient number, since it is larger than the sum of its proper divisors (1).

921938939 is an equidigital number, since it uses as much as digits as its factorization.

921938939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 53.

The square root of 921938939 is about 30363.4474162602. The cubic root of 921938939 is about 973.2716041756.

The spelling of 921938939 in words is "nine hundred twenty-one million, nine hundred thirty-eight thousand, nine hundred thirty-nine".