1669209401 has 8 divisors (see below), whose sum is σ = 1701311040. Its totient is φ = 1637130352.

The previous prime is 1669209349. The next prime is 1669209403. The reversal of 1669209401 is 1049029661.

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 1669209401 - 2¹⁰ = 1669208377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669209403) 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, 278090 + ... + 284028.

It is an arithmetic number, because the mean of its divisors is an integer number (212663880).

Almost surely, 2^1669209401 is an apocalyptic number.

It is an amenable number.

1669209401 is a deficient number, since it is larger than the sum of its proper divisors (32101639).

1669209401 is an equidigital number, since it uses as much as digits as its factorization.

1669209401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11295.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1669209401 is about 40855.9591859009. The cubic root of 1669209401 is about 1186.2337441102.

The spelling of 1669209401 in words is "one billion, six hundred sixty-nine million, two hundred nine thousand, four hundred one".