1989779343 has 4 divisors (see below), whose sum is σ = 2653039128. Its totient is φ = 1326519560.

The previous prime is 1989779329. The next prime is 1989779359. The reversal of 1989779343 is 3439779891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1989779343 - 2⁸ = 1989779087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989779843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331629888 + ... + 331629893.

It is an arithmetic number, because the mean of its divisors is an integer number (663259782).

Almost surely, 2^1989779343 is an apocalyptic number.

1989779343 is a deficient number, since it is larger than the sum of its proper divisors (663259785).

1989779343 is an equidigital number, since it uses as much as digits as its factorization.

1989779343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663259784.

The product of its digits is 10287648, while the sum is 60.

The square root of 1989779343 is about 44606.9427667936. The cubic root of 1989779343 is about 1257.7711800620.

The spelling of 1989779343 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-nine thousand, three hundred forty-three".