1989643588954 has 16 divisors (see below), whose sum is σ = 3559113998208. Its totient is φ = 815630290992.

The previous prime is 1989643588909. The next prime is 1989643588963. The reversal of 1989643588954 is 4598853469891.

It is a happy number.

It is a super-2 number, since 2×1989643588954² (a number of 25 digits) contains 22 as substring.

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, 3089508357 + ... + 3089509000.

It is an arithmetic number, because the mean of its divisors is an integer number (222444624888).

Almost surely, 2^{1989643588954} is an apocalyptic number.

1989643588954 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1989643588954 is a deficient number, since it is larger than the sum of its proper divisors (1569470409254).

1989643588954 is a wasteful number, since it uses less digits than its factorization.

1989643588954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179017389.

The product of its digits is 2687385600, while the sum is 79.

The spelling of 1989643588954 in words is "one trillion, nine hundred eighty-nine billion, six hundred forty-three million, five hundred eighty-eight thousand, nine hundred fifty-four".