1989587964 has 288 divisors, whose sum is σ = 6213043200. Its totient is φ = 492283008.

The previous prime is 1989587959. The next prime is 1989587989. The reversal of 1989587964 is 4697859891.

It is a junction number, because it is equal to n+sod(n) for n = 1989587895 and 1989587904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19316337 + ... + 19316439.

Almost surely, 2^1989587964 is an apocalyptic number.

1989587964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989587964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3106521600).

1989587964 is an abundant number, since it is smaller than the sum of its proper divisors (4223455236).

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

1989587964 is a wasteful number, since it uses less digits than its factorization.

1989587964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 147 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 66.

The square root of 1989587964 is about 44604.7975446588. The cubic root of 1989587964 is about 1257.7308541988.

The spelling of 1989587964 in words is "one billion, nine hundred eighty-nine million, five hundred eighty-seven thousand, nine hundred sixty-four".