1340686 has 4 divisors (see below), whose sum is σ = 2011032. Its totient is φ = 670342.

The previous prime is 1340681. The next prime is 1340687. The reversal of 1340686 is 6860431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6860431 = 2557 ⋅2683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335170 + ... + 335173.

It is an arithmetic number, because the mean of its divisors is an integer number (502758).

2^1340686 is an apocalyptic number.

1340686 is a deficient number, since it is larger than the sum of its proper divisors (670346).

1340686 is an equidigital number, since it uses as much as digits as its factorization.

1340686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670345.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1340686 is about 1157.8799592358. The cubic root of 1340686 is about 110.2661872938.

It can be divided in two parts, 134068 and 6, that multiplied together give a palindrome (804408).

The spelling of 1340686 in words is "one million, three hundred forty thousand, six hundred eighty-six".