1365981 has 8 divisors (see below), whose sum is σ = 1863840. Its totient is φ = 889392.

The previous prime is 1365979. The next prime is 1365983. The reversal of 1365981 is 1895631.

It is an interprime number because it is at equal distance from previous prime (1365979) and next prime (1365983).

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

It is not a de Polignac number, because 1365981 - 2¹ = 1365979 is a prime.

It is a super-2 number, since 2×1365981² = 3731808184722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365983) 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, 5166 + ... + 5423.

It is an arithmetic number, because the mean of its divisors is an integer number (232980).

2^1365981 is an apocalyptic number.

It is an amenable number.

1365981 is a deficient number, since it is larger than the sum of its proper divisors (497859).

1365981 is a wasteful number, since it uses less digits than its factorization.

1365981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635.

The product of its digits is 6480, while the sum is 33.

The square root of 1365981 is about 1168.7518983942. The cubic root of 1365981 is about 110.9553428022.

It can be divided in two parts, 1365 and 981, that added together give a triangular number (2346 = T₆₈).

The spelling of 1365981 in words is "one million, three hundred sixty-five thousand, nine hundred eighty-one".