7861393 has 2 divisors, whose sum is σ = 7861394. Its totient is φ = 7861392.

The previous prime is 7861391. The next prime is 7861409. The reversal of 7861393 is 3931687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5992704 + 1868689 = 2448^2 + 1367^2 .

It is an emirp because it is prime and its reverse (3931687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7861393 - 2¹ = 7861391 is a prime.

Together with 7861391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7861391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930696 + 3930697.

It is an arithmetic number, because the mean of its divisors is an integer number (3930697).

Almost surely, 2^7861393 is an apocalyptic number.

It is an amenable number.

7861393 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861393 is an equidigital number, since it uses as much as digits as its factorization.

7861393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 7861393 is about 2803.8175760916. The cubic root of 7861393 is about 198.8382059070.

The spelling of 7861393 in words is "seven million, eight hundred sixty-one thousand, three hundred ninety-three".