743920921 has 2 divisors, whose sum is σ = 743920922. Its totient is φ = 743920920.

The previous prime is 743920909. The next prime is 743920943. The reversal of 743920921 is 129029347.

743920921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508728025 + 235192896 = 22555^2 + 15336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743920921 is a prime.

It is not a weakly prime, because it can be changed into another prime (743920951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371960460 + 371960461.

It is an arithmetic number, because the mean of its divisors is an integer number (371960461).

Almost surely, 2^743920921 is an apocalyptic number.

It is an amenable number.

743920921 is a deficient number, since it is larger than the sum of its proper divisors (1).

743920921 is an equidigital number, since it uses as much as digits as its factorization.

743920921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 743920921 is about 27274.9137670498. The cubic root of 743920921 is about 906.0988741671.

The spelling of 743920921 in words is "seven hundred forty-three million, nine hundred twenty thousand, nine hundred twenty-one".