1989428019 has 8 divisors (see below), whose sum is σ = 2655598800. Its totient is φ = 1324771296.

The previous prime is 1989428011. The next prime is 1989428071. The reversal of 1989428019 is 9108249891.

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

It is not a de Polignac number, because 1989428019 - 2³ = 1989428011 is a prime.

It is a super-2 number, since 2×1989428019² = 7915647685564528722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1989428011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375444 + ... + 380705.

It is an arithmetic number, because the mean of its divisors is an integer number (331949850).

Almost surely, 2^1989428019 is an apocalyptic number.

1989428019 is a deficient number, since it is larger than the sum of its proper divisors (666170781).

1989428019 is an equidigital number, since it uses as much as digits as its factorization.

1989428019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757029.

The product of its (nonzero) digits is 373248, while the sum is 51.

The square root of 1989428019 is about 44603.0045961032. The cubic root of 1989428019 is about 1257.6971498748.

The spelling of 1989428019 in words is "one billion, nine hundred eighty-nine million, four hundred twenty-eight thousand, nineteen".