1669349836 has 72 divisors (see below), whose sum is σ = 3715794432. Its totient is φ = 648900000.

The previous prime is 1669349789. The next prime is 1669349837. The reversal of 1669349836 is 6389439661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669349837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1618641 + ... + 1619671.

It is an arithmetic number, because the mean of its divisors is an integer number (51608256).

Almost surely, 2^1669349836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669349836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1857897216).

1669349836 is an abundant number, since it is smaller than the sum of its proper divisors (2046444596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1669349836 is a wasteful number, since it uses less digits than its factorization.

1669349836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1802 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 55.

The square root of 1669349836 is about 40857.6778096847. The cubic root of 1669349836 is about 1186.2670101710.

The spelling of 1669349836 in words is "one billion, six hundred sixty-nine million, three hundred forty-nine thousand, eight hundred thirty-six".