755720389 has 2 divisors, whose sum is σ = 755720390. Its totient is φ = 755720388.

The previous prime is 755720377. The next prime is 755720393. The reversal of 755720389 is 983027557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486202500 + 269517889 = 22050^2 + 16417^2 .

It is a cyclic number.

It is not a de Polignac number, because 755720389 - 2¹³ = 755712197 is a prime.

It is a super-2 number, since 2×755720389² = 1142226612700622642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (755720369) 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, 377860194 + 377860195.

It is an arithmetic number, because the mean of its divisors is an integer number (377860195).

Almost surely, 2^755720389 is an apocalyptic number.

It is an amenable number.

755720389 is a deficient number, since it is larger than the sum of its proper divisors (1).

755720389 is an equidigital number, since it uses as much as digits as its factorization.

755720389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 46.

The square root of 755720389 is about 27490.3690226232. The cubic root of 755720389 is about 910.8643677032.

The spelling of 755720389 in words is "seven hundred fifty-five million, seven hundred twenty thousand, three hundred eighty-nine".