1642389489 has 18 divisors (see below), whose sum is σ = 2568867990. Its totient is φ = 1010700288.

The previous prime is 1642389473. The next prime is 1642389491. The reversal of 1642389489 is 9849832461.

1642389489 is a `hidden beast` number, since 1 + 64 + 23 + 89 + 489 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 31169889 + 1611219600 = 5583^2 + 40140^2 .

It is not a de Polignac number, because 1642389489 - 2⁴ = 1642389473 is a prime.

It is a super-2 number, since 2×1642389489² = 5394886467155362242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1642389449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 538384 + ... + 541425.

Almost surely, 2^1642389489 is an apocalyptic number.

It is an amenable number.

1642389489 is a deficient number, since it is larger than the sum of its proper divisors (926478501).

1642389489 is a wasteful number, since it uses less digits than its factorization.

1642389489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079841 (or 1079825 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 1642389489 is about 40526.4048368468. The cubic root of 1642389489 is about 1179.8461661472.

The spelling of 1642389489 in words is "one billion, six hundred forty-two million, three hundred eighty-nine thousand, four hundred eighty-nine".