19890669 has 4 divisors (see below), whose sum is σ = 26520896. Its totient is φ = 13260444.

The previous prime is 19890649. The next prime is 19890671. The reversal of 19890669 is 96609891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19890669 - 2⁸ = 19890413 is a prime.

It is a super-2 number, since 2×19890669² = 791277426535122, 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 (19890649) 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, 3315109 + ... + 3315114.

It is an arithmetic number, because the mean of its divisors is an integer number (6630224).

Almost surely, 2^19890669 is an apocalyptic number.

It is an amenable number.

19890669 is a deficient number, since it is larger than the sum of its proper divisors (6630227).

19890669 is an equidigital number, since it uses as much as digits as its factorization.

19890669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630226.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 19890669 is about 4459.8956265814. The cubic root of 19890669 is about 270.9462409760.

The spelling of 19890669 in words is "nineteen million, eight hundred ninety thousand, six hundred sixty-nine".