740349581 has 2 divisors, whose sum is σ = 740349582. Its totient is φ = 740349580.

The previous prime is 740349569. The next prime is 740349637. The reversal of 740349581 is 185943047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 711555625 + 28793956 = 26675^2 + 5366^2 .

It is a cyclic number.

It is not a de Polignac number, because 740349581 - 2⁶ = 740349517 is a prime.

It is a super-2 number, since 2×740349581² = 1096235004173751122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740349551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370174790 + 370174791.

It is an arithmetic number, because the mean of its divisors is an integer number (370174791).

Almost surely, 2^740349581 is an apocalyptic number.

It is an amenable number.

740349581 is a deficient number, since it is larger than the sum of its proper divisors (1).

740349581 is an equidigital number, since it uses as much as digits as its factorization.

740349581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 740349581 is about 27209.3656853665. The cubic root of 740349581 is about 904.6465785222.

The spelling of 740349581 in words is "seven hundred forty million, three hundred forty-nine thousand, five hundred eighty-one".