740378321 has 2 divisors, whose sum is σ = 740378322. Its totient is φ = 740378320.

The previous prime is 740378311. The next prime is 740378347. The reversal of 740378321 is 123873047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376942225 + 363436096 = 19415^2 + 19064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740378321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (740378311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370189160 + 370189161.

It is an arithmetic number, because the mean of its divisors is an integer number (370189161).

Almost surely, 2^740378321 is an apocalyptic number.

It is an amenable number.

740378321 is a deficient number, since it is larger than the sum of its proper divisors (1).

740378321 is an equidigital number, since it uses as much as digits as its factorization.

740378321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 740378321 is about 27209.8938072165. The cubic root of 740378321 is about 904.6582843464.

The spelling of 740378321 in words is "seven hundred forty million, three hundred seventy-eight thousand, three hundred twenty-one".