1649998879 has 8 divisors (see below), whose sum is σ = 1667494080. Its totient is φ = 1632592416.

The previous prime is 1649998871. The next prime is 1649998919. The reversal of 1649998879 is 9788999461.

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

It is a cyclic number.

It is not a de Polignac number, because 1649998879 - 2³ = 1649998871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649998871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15537 + ... + 59509.

It is an arithmetic number, because the mean of its divisors is an integer number (208436760).

Almost surely, 2^1649998879 is an apocalyptic number.

1649998879 is a deficient number, since it is larger than the sum of its proper divisors (17495201).

1649998879 is a wasteful number, since it uses less digits than its factorization.

1649998879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44369.

The product of its digits is 70543872, while the sum is 70.

The square root of 1649998879 is about 40620.1782246213. The cubic root of 1649998879 is about 1181.6654828619.

The spelling of 1649998879 in words is "one billion, six hundred forty-nine million, nine hundred ninety-eight thousand, eight hundred seventy-nine".