1965981 has 8 divisors (see below), whose sum is σ = 2660704. Its totient is φ = 1290960.

The previous prime is 1965979. The next prime is 1965983. The reversal of 1965981 is 1895691.

It is an interprime number because it is at equal distance from previous prime (1965979) and next prime (1965983).

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

It is not a de Polignac number, because 1965981 - 2¹ = 1965979 is a prime.

It is a super-2 number, since 2×1965981² = 7730162584722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4690 + ... + 5091.

It is an arithmetic number, because the mean of its divisors is an integer number (332588).

2^1965981 is an apocalyptic number.

It is an amenable number.

1965981 is a deficient number, since it is larger than the sum of its proper divisors (694723).

1965981 is an equidigital number, since it uses as much as digits as its factorization.

1965981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9851.

The product of its digits is 19440, while the sum is 39.

The square root of 1965981 is about 1402.1344443383. The cubic root of 1965981 is about 125.2736617700.

The spelling of 1965981 in words is "one million, nine hundred sixty-five thousand, nine hundred eighty-one".