73638493 has 2 divisors, whose sum is σ = 73638494. Its totient is φ = 73638492.

The previous prime is 73638491. The next prime is 73638517. The reversal of 73638493 is 39483637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48818169 + 24820324 = 6987^2 + 4982^2 .

It is an emirp because it is prime and its reverse (39483637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73638493 - 2¹ = 73638491 is a prime.

It is a super-2 number, since 2×73638493² = 10845255302622098, which contains 22 as substring.

Together with 73638491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73638491) 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, 36819246 + 36819247.

It is an arithmetic number, because the mean of its divisors is an integer number (36819247).

Almost surely, 2^73638493 is an apocalyptic number.

It is an amenable number.

73638493 is a deficient number, since it is larger than the sum of its proper divisors (1).

73638493 is an equidigital number, since it uses as much as digits as its factorization.

73638493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 43.

The square root of 73638493 is about 8581.2873742813. The cubic root of 73638493 is about 419.1488678001.

The spelling of 73638493 in words is "seventy-three million, six hundred thirty-eight thousand, four hundred ninety-three".