1366641 has 6 divisors (see below), whose sum is σ = 1974050. Its totient is φ = 911088.

The previous prime is 1366639. The next prime is 1366643. The reversal of 1366641 is 1466631.

It is an interprime number because it is at equal distance from previous prime (1366639) and next prime (1366643).

It can be written as a sum of positive squares in only one way, i.e., 848241 + 518400 = 921^2 + 720^2 .

It is not a de Polignac number, because 1366641 - 2¹ = 1366639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1366643) 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 5 ways as a sum of consecutive naturals, for example, 75916 + ... + 75933.

2^1366641 is an apocalyptic number.

It is an amenable number.

1366641 is a deficient number, since it is larger than the sum of its proper divisors (607409).

1366641 is a wasteful number, since it uses less digits than its factorization.

1366641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151855 (or 151852 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1366641 is about 1169.0342167790. The cubic root of 1366641 is about 110.9732099944.

The spelling of 1366641 in words is "one million, three hundred sixty-six thousand, six hundred forty-one".