1359981 has 12 divisors (see below), whose sum is σ = 2245152. Its totient is φ = 777096.

The previous prime is 1359979. The next prime is 1359991. The reversal of 1359981 is 1899531.

It is a happy number.

It is not a de Polignac number, because 1359981 - 2¹ = 1359979 is a prime.

It is a super-2 number, since 2×1359981² = 3699096640722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1359901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10731 + ... + 10856.

It is an arithmetic number, because the mean of its divisors is an integer number (187096).

2^1359981 is an apocalyptic number.

It is an amenable number.

1359981 is a deficient number, since it is larger than the sum of its proper divisors (885171).

1359981 is a wasteful number, since it uses less digits than its factorization.

1359981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21600 (or 21597 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1359981 is about 1166.1822327578. The cubic root of 1359981 is about 110.7926491841.

The spelling of 1359981 in words is "one million, three hundred fifty-nine thousand, nine hundred eighty-one".