7861493 has 2 divisors, whose sum is σ = 7861494. Its totient is φ = 7861492.

The previous prime is 7861489. The next prime is 7861499. The reversal of 7861493 is 3941687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5793649 + 2067844 = 2407^2 + 1438^2 .

It is an emirp because it is prime and its reverse (3941687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7861493 - 2² = 7861489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7861499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930746 + 3930747.

It is an arithmetic number, because the mean of its divisors is an integer number (3930747).

Almost surely, 2^7861493 is an apocalyptic number.

It is an amenable number.

7861493 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861493 is an equidigital number, since it uses as much as digits as its factorization.

7861493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 7861493 is about 2803.8354088641. The cubic root of 7861493 is about 198.8390490034.

The spelling of 7861493 in words is "seven million, eight hundred sixty-one thousand, four hundred ninety-three".