72990439 has 2 divisors, whose sum is σ = 72990440. Its totient is φ = 72990438.

The previous prime is 72990383. The next prime is 72990443. The reversal of 72990439 is 93409927.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72990439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72990395 and 72990404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72999439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36495219 + 36495220.

It is an arithmetic number, because the mean of its divisors is an integer number (36495220).

Almost surely, 2^72990439 is an apocalyptic number.

72990439 is a deficient number, since it is larger than the sum of its proper divisors (1).

72990439 is an equidigital number, since it uses as much as digits as its factorization.

72990439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 72990439 is about 8543.4442117919. Note that the first 3 decimals coincide. The cubic root of 72990439 is about 417.9156728771.

The spelling of 72990439 in words is "seventy-two million, nine hundred ninety thousand, four hundred thirty-nine".