1366890 has 64 divisors (see below), whose sum is σ = 3926016. Its totient is φ = 297792.

The previous prime is 1366889. The next prime is 1366903. The reversal of 1366890 is 986631.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4689 + ... + 4971.

It is an arithmetic number, because the mean of its divisors is an integer number (61344).

2^1366890 is an apocalyptic number.

1366890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1366890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1963008).

1366890 is an abundant number, since it is smaller than the sum of its proper divisors (2559126).

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

1366890 is a wasteful number, since it uses less digits than its factorization.

1366890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1366890 is about 1169.1407100944. The cubic root of 1366890 is about 110.9799493042.

The spelling of 1366890 in words is "one million, three hundred sixty-six thousand, eight hundred ninety".