1816489669 has 8 divisors (see below), whose sum is σ = 1837442880. Its totient is φ = 1795649376.

The previous prime is 1816489667. The next prime is 1816489679. The reversal of 1816489669 is 9669846181.

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 1816489669 - 2¹ = 1816489667 is a prime.

It is a super-2 number, since 2×1816489669² = 6599269435167459122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816489667) 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, 4344 + ... + 60430.

It is an arithmetic number, because the mean of its divisors is an integer number (229680360).

Almost surely, 2^1816489669 is an apocalyptic number.

It is an amenable number.

1816489669 is a deficient number, since it is larger than the sum of its proper divisors (20953211).

1816489669 is a wasteful number, since it uses less digits than its factorization.

1816489669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56459.

The product of its digits is 4478976, while the sum is 58.

The square root of 1816489669 is about 42620.2964442999. The cubic root of 1816489669 is about 1220.1436875016.

The spelling of 1816489669 in words is "one billion, eight hundred sixteen million, four hundred eighty-nine thousand, six hundred sixty-nine".