147720989 has 4 divisors (see below), whose sum is σ = 159084156. Its totient is φ = 136357824.

The previous prime is 147720977. The next prime is 147721027. The reversal of 147720989 is 989027741.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10432900 + 137288089 = 3230^2 + 11717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-147720989 is a prime.

It is a super-2 number, since 2×147720989² = 43642981182276242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147720959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5681564 + ... + 5681589.

It is an arithmetic number, because the mean of its divisors is an integer number (39771039).

Almost surely, 2^147720989 is an apocalyptic number.

It is an amenable number.

147720989 is a deficient number, since it is larger than the sum of its proper divisors (11363167).

147720989 is a wasteful number, since it uses less digits than its factorization.

147720989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11363166.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 147720989 is about 12154.0523694774. The cubic root of 147720989 is about 528.6246397681.

The spelling of 147720989 in words is "one hundred forty-seven million, seven hundred twenty thousand, nine hundred eighty-nine".