1805739649 has 8 divisors (see below), whose sum is σ = 2075232960. Its totient is φ = 1539128976.

The previous prime is 1805739647. The next prime is 1805739653. The reversal of 1805739649 is 9469375081.

It is a happy number.

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

It is not a de Polignac number, because 1805739649 - 2¹ = 1805739647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1805739596 and 1805739605.

It is not an unprimeable number, because it can be changed into a prime (1805739647) 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, 719314 + ... + 721819.

It is an arithmetic number, because the mean of its divisors is an integer number (259404120).

Almost surely, 2^1805739649 is an apocalyptic number.

It is an amenable number.

1805739649 is a deficient number, since it is larger than the sum of its proper divisors (269493311).

1805739649 is a wasteful number, since it uses less digits than its factorization.

1805739649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441319.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 1805739649 is about 42493.9954464157. The cubic root of 1805739649 is about 1217.7319792903.

The spelling of 1805739649 in words is "one billion, eight hundred five million, seven hundred thirty-nine thousand, six hundred forty-nine".