7686401 has 4 divisors (see below), whose sum is σ = 7692804. Its totient is φ = 7680000.

The previous prime is 7686391. The next prime is 7686443. The reversal of 7686401 is 1046867.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6635776 + 1050625 = 2576^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7686401 is a prime.

It is a deceptive number, since it divides R_7686400.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7686101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 4001.

It is an arithmetic number, because the mean of its divisors is an integer number (1923201).

Almost surely, 2^7686401 is an apocalyptic number.

7686401 is the 1601-st octagonal number.

It is an amenable number.

7686401 is a deficient number, since it is larger than the sum of its proper divisors (6403).

7686401 is a wasteful number, since it uses less digits than its factorization.

7686401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 7686401 is about 2772.4359325330. The cubic root of 7686401 is about 197.3517640012.

The spelling of 7686401 in words is "seven million, six hundred eighty-six thousand, four hundred one".