1649867999 has 8 divisors (see below), whose sum is σ = 1824802560. Its totient is φ = 1481793696.

The previous prime is 1649867981. The next prime is 1649868013. The reversal of 1649867999 is 9997689461.

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 1649867999 - 2¹⁶ = 1649802463 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 (1649867909) 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, 1714559 + ... + 1715520.

It is an arithmetic number, because the mean of its divisors is an integer number (228100320).

Almost surely, 2^1649867999 is an apocalyptic number.

1649867999 is a deficient number, since it is larger than the sum of its proper divisors (174934561).

1649867999 is a wasteful number, since it uses less digits than its factorization.

1649867999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430129.

The product of its digits is 52907904, while the sum is 68.

The square root of 1649867999 is about 40618.5671706918. The cubic root of 1649867999 is about 1181.6342383018.

The spelling of 1649867999 in words is "one billion, six hundred forty-nine million, eight hundred sixty-seven thousand, nine hundred ninety-nine".