669619 has 4 divisors (see below), whose sum is σ = 671944. Its totient is φ = 667296.

The previous prime is 669611. The next prime is 669637. The reversal of 669619 is 916966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916966 = 2 ⋅458483.

It is a cyclic number.

It is not a de Polignac number, because 669619 - 2³ = 669611 is a prime.

It is a super-2 number, since 2×669619² = 896779210322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669611) 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, 657 + ... + 1330.

It is an arithmetic number, because the mean of its divisors is an integer number (167986).

2⁶⁶⁹⁶¹⁹ is an apocalyptic number.

669619 is a deficient number, since it is larger than the sum of its proper divisors (2325).

669619 is a wasteful number, since it uses less digits than its factorization.

669619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324.

The product of its digits is 17496, while the sum is 37.

The square root of 669619 is about 818.3025113001. The cubic root of 669619 is about 87.4868116177.

It can be divided in two parts, 6 and 69619, that multiplied together give a palindrome (417714).

The spelling of 669619 in words is "six hundred sixty-nine thousand, six hundred nineteen".