1307681 has 4 divisors (see below), whose sum is σ = 1335552. Its totient is φ = 1279812.

The previous prime is 1307671. The next prime is 1307689. The reversal of 1307681 is 1867031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1867031 = 53 ⋅35227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1307681 is a prime.

It is a super-2 number, since 2×1307681² = 3420059195522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1307681.

It is not an unprimeable number, because it can be changed into a prime (1307689) 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, 13865 + ... + 13958.

It is an arithmetic number, because the mean of its divisors is an integer number (333888).

2^1307681 is an apocalyptic number.

It is an amenable number.

1307681 is a deficient number, since it is larger than the sum of its proper divisors (27871).

1307681 is an equidigital number, since it uses as much as digits as its factorization.

1307681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27870.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1307681 is about 1143.5388056380. The cubic root of 1307681 is about 109.3538147812.

The spelling of 1307681 in words is "one million, three hundred seven thousand, six hundred eighty-one".