72340397 has 2 divisors, whose sum is σ = 72340398. Its totient is φ = 72340396.

The previous prime is 72340363. The next prime is 72340399. The reversal of 72340397 is 79304327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58583716 + 13756681 = 7654^2 + 3709^2 .

It is an emirp because it is prime and its reverse (79304327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72340397 - 2⁸ = 72340141 is a prime.

Together with 72340399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72340399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36170198 + 36170199.

It is an arithmetic number, because the mean of its divisors is an integer number (36170199).

Almost surely, 2^72340397 is an apocalyptic number.

It is an amenable number.

72340397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72340397 is an equidigital number, since it uses as much as digits as its factorization.

72340397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 72340397 is about 8505.3158083636. The cubic root of 72340397 is about 416.6713399654.

The spelling of 72340397 in words is "seventy-two million, three hundred forty thousand, three hundred ninety-seven".