72390749 has 2 divisors, whose sum is σ = 72390750. Its totient is φ = 72390748.

The previous prime is 72390733. The next prime is 72390751. The reversal of 72390749 is 94709327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 5968249 = 8150^2 + 2443^2 .

It is a cyclic number.

It is not a de Polignac number, because 72390749 - 2⁴ = 72390733 is a prime.

It is a Sophie Germain prime.

Together with 72390751, it forms a pair of twin primes.

It is a Chen 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 (72390649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36195374 + 36195375.

It is an arithmetic number, because the mean of its divisors is an integer number (36195375).

Almost surely, 2^72390749 is an apocalyptic number.

It is an amenable number.

72390749 is a deficient number, since it is larger than the sum of its proper divisors (1).

72390749 is an equidigital number, since it uses as much as digits as its factorization.

72390749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 72390749 is about 8508.2753246472. The cubic root of 72390749 is about 416.7679912158.

The spelling of 72390749 in words is "seventy-two million, three hundred ninety thousand, seven hundred forty-nine".