1668409926 has 24 divisors (see below), whose sum is σ = 3488213400. Its totient is φ = 531955776.

The previous prime is 1668409921. The next prime is 1668409943. The reversal of 1668409926 is 6299048661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668409921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259651 + ... + 265998.

It is an arithmetic number, because the mean of its divisors is an integer number (145342225).

Almost surely, 2^1668409926 is an apocalyptic number.

1668409926 is an abundant number, since it is smaller than the sum of its proper divisors (1819803474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668409926 is a wasteful number, since it uses less digits than its factorization.

1668409926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525700 (or 525677 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 1668409926 is about 40846.1739456708. The cubic root of 1668409926 is about 1186.0443299540.

The spelling of 1668409926 in words is "one billion, six hundred sixty-eight million, four hundred nine thousand, nine hundred twenty-six".