72399893 has 2 divisors, whose sum is σ = 72399894. Its totient is φ = 72399892.

The previous prime is 72399869. The next prime is 72399959. The reversal of 72399893 is 39899327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47018449 + 25381444 = 6857^2 + 5038^2 .

It is a cyclic number.

It is not a de Polignac number, because 72399893 - 2⁶ = 72399829 is a prime.

It is a super-2 number, since 2×72399893² = 10483489012822898, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72399293) 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, 36199946 + 36199947.

It is an arithmetic number, because the mean of its divisors is an integer number (36199947).

Almost surely, 2^72399893 is an apocalyptic number.

It is an amenable number.

72399893 is a deficient number, since it is larger than the sum of its proper divisors (1).

72399893 is an equidigital number, since it uses as much as digits as its factorization.

72399893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 72399893 is about 8508.8126668766. The cubic root of 72399893 is about 416.7855384214.

The spelling of 72399893 in words is "seventy-two million, three hundred ninety-nine thousand, eight hundred ninety-three".