1366631 has 8 divisors (see below), whose sum is σ = 1578144. Its totient is φ = 1159200.

The previous prime is 1366627. The next prime is 1366639.

1366631 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1366631 - 2² = 1366627 is a prime.

It is a super-2 number, since 2×1366631² = 3735360580322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1366631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (197268).

2^1366631 is an apocalyptic number.

1366631 is a deficient number, since it is larger than the sum of its proper divisors (211513).

1366631 is a wasteful number, since it uses less digits than its factorization.

1366631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041.

The product of its digits is 1944, while the sum is 26.

The square root of 1366631 is about 1169.0299397364. The cubic root of 1366631 is about 110.9729393223.

The spelling of 1366631 in words is "one million, three hundred sixty-six thousand, six hundred thirty-one".