72924389 has 2 divisors, whose sum is σ = 72924390. Its totient is φ = 72924388.

The previous prime is 72924367. The next prime is 72924403. The reversal of 72924389 is 98342927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69472225 + 3452164 = 8335^2 + 1858^2 .

It is an emirp because it is prime and its reverse (98342927) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72924389 is a prime.

It is a super-2 number, since 2×72924389² = 10635933022046642, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4279877 and since 72924389 and 4279877 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72954389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36462194 + 36462195.

It is an arithmetic number, because the mean of its divisors is an integer number (36462195).

Almost surely, 2^72924389 is an apocalyptic number.

It is an amenable number.

72924389 is a deficient number, since it is larger than the sum of its proper divisors (1).

72924389 is an equidigital number, since it uses as much as digits as its factorization.

72924389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 72924389 is about 8539.5777998681. The cubic root of 72924389 is about 417.7895757199.

It can be divided in two parts, 729 and 24389, that multiplied together give a cube (17779581 = 261³).

The spelling of 72924389 in words is "seventy-two million, nine hundred twenty-four thousand, three hundred eighty-nine".