1988943469 has 4 divisors (see below), whose sum is σ = 2075419296. Its totient is φ = 1902467644.

The previous prime is 1988943413. The next prime is 1988943521. The reversal of 1988943469 is 9643498891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1988943469 is a prime.

It is a super-2 number, since 2×1988943469² = 7911792245755507922, 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 (1988943269) 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, 43237879 + ... + 43237924.

It is an arithmetic number, because the mean of its divisors is an integer number (518854824).

Almost surely, 2^1988943469 is an apocalyptic number.

It is an amenable number.

1988943469 is a deficient number, since it is larger than the sum of its proper divisors (86475827).

1988943469 is an equidigital number, since it uses as much as digits as its factorization.

1988943469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86475826.

The product of its digits is 13436928, while the sum is 61.

The square root of 1988943469 is about 44597.5724563569. The cubic root of 1988943469 is about 1257.5950323093.

The spelling of 1988943469 in words is "one billion, nine hundred eighty-eight million, nine hundred forty-three thousand, four hundred sixty-nine".