1988869433 has 4 divisors (see below), whose sum is σ = 2002217700. Its totient is φ = 1975521168.

The previous prime is 1988869429. The next prime is 1988869447. The reversal of 1988869433 is 3349688891.

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 208282624 + 1780586809 = 14432^2 + 42197^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988869433 - 2² = 1988869429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988869453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6673910 + ... + 6674207.

It is an arithmetic number, because the mean of its divisors is an integer number (500554425).

Almost surely, 2^1988869433 is an apocalyptic number.

It is an amenable number.

1988869433 is a deficient number, since it is larger than the sum of its proper divisors (13348267).

1988869433 is a wasteful number, since it uses less digits than its factorization.

1988869433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13348266.

The product of its digits is 8957952, while the sum is 59.

The square root of 1988869433 is about 44596.7424034536. The cubic root of 1988869433 is about 1257.5794279676.

The spelling of 1988869433 in words is "one billion, nine hundred eighty-eight million, eight hundred sixty-nine thousand, four hundred thirty-three".