1989772860 has 24 divisors (see below), whose sum is σ = 5571364176. Its totient is φ = 530606080.

The previous prime is 1989772843. The next prime is 1989772877. The reversal of 1989772860 is 682779891.

It is an interprime number because it is at equal distance from previous prime (1989772843) and next prime (1989772877).

It is a self number, because there is not a number n which added to its sum of digits gives 1989772860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16581381 + ... + 16581500.

It is an arithmetic number, because the mean of its divisors is an integer number (232140174).

Almost surely, 2^1989772860 is an apocalyptic number.

1989772860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989772860 is an abundant number, since it is smaller than the sum of its proper divisors (3581591316).

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

1989772860 is a wasteful number, since it uses less digits than its factorization.

1989772860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33162893 (or 33162891 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 57.

The square root of 1989772860 is about 44606.8700986743. The cubic root of 1989772860 is about 1257.7698140580.

The spelling of 1989772860 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-two thousand, eight hundred sixty".