19674989 has 4 divisors (see below), whose sum is σ = 19685820. Its totient is φ = 19664160.

The previous prime is 19674979. The next prime is 19674997. The reversal of 19674989 is 98947691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98947691 = 31 ⋅3191861.

It can be written as a sum of positive squares in 2 ways, for example, as 13213225 + 6461764 = 3635^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 19674989 - 2⁴ = 19674973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19674989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19674979) 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, 1952 + ... + 6569.

It is an arithmetic number, because the mean of its divisors is an integer number (4921455).

Almost surely, 2^19674989 is an apocalyptic number.

It is an amenable number.

19674989 is a deficient number, since it is larger than the sum of its proper divisors (10831).

19674989 is an equidigital number, since it uses as much as digits as its factorization.

19674989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10830.

The product of its digits is 979776, while the sum is 53.

The square root of 19674989 is about 4435.6497832899. The cubic root of 19674989 is about 269.9633649425.

The spelling of 19674989 in words is "nineteen million, six hundred seventy-four thousand, nine hundred eighty-nine".