1669407893 has 4 divisors (see below), whose sum is σ = 1673699820. Its totient is φ = 1665115968.

The previous prime is 1669407809. The next prime is 1669407911. The reversal of 1669407893 is 3987049661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200448964 + 1468958929 = 14158^2 + 38327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669407893 - 2¹² = 1669403797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689407893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145380 + ... + 2146157.

It is an arithmetic number, because the mean of its divisors is an integer number (418424955).

Almost surely, 2^1669407893 is an apocalyptic number.

It is an amenable number.

1669407893 is a deficient number, since it is larger than the sum of its proper divisors (4291927).

1669407893 is an equidigital number, since it uses as much as digits as its factorization.

1669407893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291926.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 1669407893 is about 40858.3882819673. The cubic root of 1669407893 is about 1186.2807620928.

The spelling of 1669407893 in words is "one billion, six hundred sixty-nine million, four hundred seven thousand, eight hundred ninety-three".