747040321 has 2 divisors, whose sum is σ = 747040322. Its totient is φ = 747040320.

The previous prime is 747040303. The next prime is 747040331. The reversal of 747040321 is 123040747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638067600 + 108972721 = 25260^2 + 10439^2 .

It is a cyclic number.

It is not a de Polignac number, because 747040321 - 2⁷ = 747040193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 747040321.

It is not a weakly prime, because it can be changed into another prime (747040331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373520160 + 373520161.

It is an arithmetic number, because the mean of its divisors is an integer number (373520161).

Almost surely, 2^747040321 is an apocalyptic number.

It is an amenable number.

747040321 is a deficient number, since it is larger than the sum of its proper divisors (1).

747040321 is an equidigital number, since it uses as much as digits as its factorization.

747040321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 747040321 is about 27332.0383616005. The cubic root of 747040321 is about 907.3635889442.

The spelling of 747040321 in words is "seven hundred forty-seven million, forty thousand, three hundred twenty-one".