1989735049 has 4 divisors (see below), whose sum is σ = 1994484240. Its totient is φ = 1984985860.

The previous prime is 1989735017. The next prime is 1989735067. The reversal of 1989735049 is 9405379891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9405379891 = 2207 ⋅4261613.

It is a cyclic number.

It is not a de Polignac number, because 1989735049 - 2⁵ = 1989735017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989735079) 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, 2373967 + ... + 2374804.

It is an arithmetic number, because the mean of its divisors is an integer number (498621060).

Almost surely, 2^1989735049 is an apocalyptic number.

It is an amenable number.

1989735049 is a deficient number, since it is larger than the sum of its proper divisors (4749191).

1989735049 is an equidigital number, since it uses as much as digits as its factorization.

1989735049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4749190.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 1989735049 is about 44606.4462718114. The cubic root of 1989735049 is about 1257.7618470120.

It can be divided in two parts, 19897 and 35049, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 1989735049 in words is "one billion, nine hundred eighty-nine million, seven hundred thirty-five thousand, forty-nine".