1989631624 has 8 divisors (see below), whose sum is σ = 3730559310. Its totient is φ = 994815808.

The previous prime is 1989631613. The next prime is 1989631639. The reversal of 1989631624 is 4261369891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1905322500 + 84309124 = 43650^2 + 9182^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 124351969 + ... + 124351984.

Almost surely, 2^1989631624 is an apocalyptic number.

It is an amenable number.

1989631624 is a deficient number, since it is larger than the sum of its proper divisors (1740927686).

1989631624 is a wasteful number, since it uses less digits than its factorization.

1989631624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248703959 (or 248703955 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 1989631624 is about 44605.2869512124. The cubic root of 1989631624 is about 1257.7400541150.

The spelling of 1989631624 in words is "one billion, nine hundred eighty-nine million, six hundred thirty-one thousand, six hundred twenty-four".