1366840 has 16 divisors (see below), whose sum is σ = 3075480. Its totient is φ = 546720.

The previous prime is 1366837. The next prime is 1366843. The reversal of 1366840 is 486631.

It is an interprime number because it is at equal distance from previous prime (1366837) and next prime (1366843).

It is a junction number, because it is equal to n+sod(n) for n = 1366799 and 1366808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17046 + ... + 17125.

2^1366840 is an apocalyptic number.

1366840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1366840 is an abundant number, since it is smaller than the sum of its proper divisors (1708640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1366840 is a wasteful number, since it uses less digits than its factorization.

1366840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34182 (or 34178 counting only the distinct ones).

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

The square root of 1366840 is about 1169.1193266729. The cubic root of 1366840 is about 110.9785960948.

The spelling of 1366840 in words is "one million, three hundred sixty-six thousand, eight hundred forty".