7718401 has 2 divisors, whose sum is σ = 7718402. Its totient is φ = 7718400.

The previous prime is 7718393. The next prime is 7718407. The reversal of 7718401 is 1048177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4946176 + 2772225 = 2224^2 + 1665^2 .

It is a cyclic number.

It is not a de Polignac number, because 7718401 - 2³ = 7718393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7718401.

It is not a weakly prime, because it can be changed into another prime (7718407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3859200 + 3859201.

It is an arithmetic number, because the mean of its divisors is an integer number (3859201).

Almost surely, 2^7718401 is an apocalyptic number.

It is an amenable number.

7718401 is a deficient number, since it is larger than the sum of its proper divisors (1).

7718401 is an equidigital number, since it uses as much as digits as its factorization.

7718401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 7718401 is about 2778.2010366422. The cubic root of 7718401 is about 197.6252562280.

The spelling of 7718401 in words is "seven million, seven hundred eighteen thousand, four hundred one".