1989779344 has 40 divisors (see below), whose sum is σ = 4413824640. Its totient is φ = 851236608.

The previous prime is 1989779329. The next prime is 1989779359. The reversal of 1989779344 is 4439779891.

It is an interprime number because it is at equal distance from previous prime (1989779329) and next prime (1989779359).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48117 + ... + 79339.

It is an arithmetic number, because the mean of its divisors is an integer number (110345616).

Almost surely, 2^1989779344 is an apocalyptic number.

1989779344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1989779344 is an abundant number, since it is smaller than the sum of its proper divisors (2424045296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989779344 is a wasteful number, since it uses less digits than its factorization.

1989779344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31807 (or 31801 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 61.

The square root of 1989779344 is about 44606.9427780026. The cubic root of 1989779344 is about 1257.7711802727.

The spelling of 1989779344 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-nine thousand, three hundred forty-four".