1989894624 has 96 divisors (see below), whose sum is σ = 5688144000. Its totient is φ = 606703104.

The previous prime is 1989894623. The next prime is 1989894629. The reversal of 1989894624 is 4264989891.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1989894624² = 7919361229248202752, which contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989894623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34087 + ... + 71705.

It is an arithmetic number, because the mean of its divisors is an integer number (59251500).

Almost surely, 2^1989894624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989894624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2844072000).

1989894624 is an abundant number, since it is smaller than the sum of its proper divisors (3698249376).

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

1989894624 is a wasteful number, since it uses less digits than its factorization.

1989894624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37680 (or 37672 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 60.

The square root of 1989894624 is about 44608.2349348189. The cubic root of 1989894624 is about 1257.7954699110.

The spelling of 1989894624 in words is "one billion, nine hundred eighty-nine million, eight hundred ninety-four thousand, six hundred twenty-four".