1989642419 has 4 divisors (see below), whose sum is σ = 2027182896. Its totient is φ = 1952101944.

The previous prime is 1989642407. The next prime is 1989642449. The reversal of 1989642419 is 9142469891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9142469891 = 12757 ⋅716663.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989642419 is a prime.

It is a super-2 number, since 2×1989642419² = 7917353910968343122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 37540423 = 1989642419 / (1 + 9 + 8 + 9 + 6 + 4 + 2 + 4 + 1 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989642449) 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 3 ways as a sum of consecutive naturals, for example, 18770159 + ... + 18770264.

It is an arithmetic number, because the mean of its divisors is an integer number (506795724).

Almost surely, 2^1989642419 is an apocalyptic number.

1989642419 is a deficient number, since it is larger than the sum of its proper divisors (37540477).

1989642419 is an equidigital number, since it uses as much as digits as its factorization.

1989642419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37540476.

The product of its digits is 1119744, while the sum is 53.

The square root of 1989642419 is about 44605.4079568834. The cubic root of 1989642419 is about 1257.7423287872.

The spelling of 1989642419 in words is "one billion, nine hundred eighty-nine million, six hundred forty-two thousand, four hundred nineteen".