1965989 has 4 divisors (see below), whose sum is σ = 2029440. Its totient is φ = 1902540.

The previous prime is 1965983. The next prime is 1966007. The reversal of 1965989 is 9895691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9895691 = 13 ⋅761207.

It is a cyclic number.

It is not a de Polignac number, because 1965989 - 2⁴ = 1965973 is a prime.

It is a super-2 number, since 2×1965989² = 7730225496242, which contains 22 as substring.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31679 + ... + 31740.

It is an arithmetic number, because the mean of its divisors is an integer number (507360).

2^1965989 is an apocalyptic number.

It is an amenable number.

1965989 is a deficient number, since it is larger than the sum of its proper divisors (63451).

1965989 is an equidigital number, since it uses as much as digits as its factorization.

1965989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63450.

The product of its digits is 174960, while the sum is 47.

The square root of 1965989 is about 1402.1372971289. The cubic root of 1965989 is about 125.2738316916.

The spelling of 1965989 in words is "one million, nine hundred sixty-five thousand, nine hundred eighty-nine".