72340417 has 2 divisors, whose sum is σ = 72340418. Its totient is φ = 72340416.

The previous prime is 72340403. The next prime is 72340421. The reversal of 72340417 is 71404327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71250481 + 1089936 = 8441^2 + 1044^2 .

It is a cyclic number.

It is not a de Polignac number, because 72340417 - 2¹⁵ = 72307649 is a prime.

It is equal to p_4247650 and since 72340417 and 4247650 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72340447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36170208 + 36170209.

It is an arithmetic number, because the mean of its divisors is an integer number (36170209).

Almost surely, 2^72340417 is an apocalyptic number.

It is an amenable number.

72340417 is a deficient number, since it is larger than the sum of its proper divisors (1).

72340417 is an equidigital number, since it uses as much as digits as its factorization.

72340417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 72340417 is about 8505.3169840988. The cubic root of 72340417 is about 416.6713783645.

The spelling of 72340417 in words is "seventy-two million, three hundred forty thousand, four hundred seventeen".