1443661989 has 16 divisors (see below), whose sum is σ = 2399854080. Its totient is φ = 749954160.

The previous prime is 1443661987. The next prime is 1443662027. The reversal of 1443661989 is 9891663441.

It is not a de Polignac number, because 1443661989 - 2¹ = 1443661987 is a prime.

It is a super-2 number, since 2×1443661989² = 4168319876966872242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1443661987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3124579 + ... + 3125040.

It is an arithmetic number, because the mean of its divisors is an integer number (149990880).

Almost surely, 2^1443661989 is an apocalyptic number.

It is an amenable number.

1443661989 is a deficient number, since it is larger than the sum of its proper divisors (956192091).

1443661989 is a wasteful number, since it uses less digits than its factorization.

1443661989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249640.

The product of its digits is 1119744, while the sum is 51.

The square root of 1443661989 is about 37995.5522265436. The cubic root of 1443661989 is about 1130.1996642512.

The spelling of 1443661989 in words is "one billion, four hundred forty-three million, six hundred sixty-one thousand, nine hundred eighty-nine".