72438397 has 2 divisors, whose sum is σ = 72438398. Its totient is φ = 72438396.

The previous prime is 72438347. The next prime is 72438403. The reversal of 72438397 is 79383427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72267001 + 171396 = 8501^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 72438397 - 2⁷ = 72438269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72438347) 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, 36219198 + 36219199.

It is an arithmetic number, because the mean of its divisors is an integer number (36219199).

Almost surely, 2^72438397 is an apocalyptic number.

It is an amenable number.

72438397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72438397 is an equidigital number, since it uses as much as digits as its factorization.

72438397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The square root of 72438397 is about 8511.0749614840. The cubic root of 72438397 is about 416.8594108433.

The spelling of 72438397 in words is "seventy-two million, four hundred thirty-eight thousand, three hundred ninety-seven".