1800809749 has 8 divisors (see below), whose sum is σ = 1866961152. Its totient is φ = 1735716960.

The previous prime is 1800809737. The next prime is 1800809761. The reversal of 1800809749 is 9479080081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1800809737) and next prime (1800809761).

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

It is not a de Polignac number, because 1800809749 - 2⁹ = 1800809237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1800809699 and 1800809708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800809729) 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, 261189 + ... + 267994.

It is an arithmetic number, because the mean of its divisors is an integer number (233370144).

Almost surely, 2^1800809749 is an apocalyptic number.

It is an amenable number.

1800809749 is a deficient number, since it is larger than the sum of its proper divisors (66151403).

1800809749 is an equidigital number, since it uses as much as digits as its factorization.

1800809749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529307.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 1800809749 is about 42435.9487816639. The cubic root of 1800809749 is about 1216.6227812865.

The spelling of 1800809749 in words is "one billion, eight hundred million, eight hundred nine thousand, seven hundred forty-nine".