1980449787 has 8 divisors (see below), whose sum is σ = 2725780480. Its totient is φ = 1277709480.

The previous prime is 1980449767. The next prime is 1980449797. The reversal of 1980449787 is 7879440891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1980449787 - 2¹⁰ = 1980448763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980449767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10647487 + ... + 10647672.

It is an arithmetic number, because the mean of its divisors is an integer number (340722560).

Almost surely, 2^1980449787 is an apocalyptic number.

1980449787 is a deficient number, since it is larger than the sum of its proper divisors (745330693).

1980449787 is a wasteful number, since it uses less digits than its factorization.

1980449787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21295193.

The product of its (nonzero) digits is 4064256, while the sum is 57.

The square root of 1980449787 is about 44502.2447411364. The cubic root of 1980449787 is about 1255.8023127530.

The spelling of 1980449787 in words is "one billion, nine hundred eighty million, four hundred forty-nine thousand, seven hundred eighty-seven".