740438509 has 2 divisors, whose sum is σ = 740438510. Its totient is φ = 740438508.

The previous prime is 740438497. The next prime is 740438551. The reversal of 740438509 is 905834047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717061284 + 23377225 = 26778^2 + 4835^2 .

It is a cyclic number.

It is not a de Polignac number, because 740438509 - 2⁵ = 740438477 is a prime.

It is a super-2 number, since 2×740438509² = 1096498371220286162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740436509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370219254 + 370219255.

It is an arithmetic number, because the mean of its divisors is an integer number (370219255).

Almost surely, 2^740438509 is an apocalyptic number.

It is an amenable number.

740438509 is a deficient number, since it is larger than the sum of its proper divisors (1).

740438509 is an equidigital number, since it uses as much as digits as its factorization.

740438509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 740438509 is about 27210.9997795009. Note that the first 3 decimals coincide. The cubic root of 740438509 is about 904.6827979840.

The spelling of 740438509 in words is "seven hundred forty million, four hundred thirty-eight thousand, five hundred nine".