1209967668 has 108 divisors (see below), whose sum is σ = 3785160288. Its totient is φ = 319101120.

The previous prime is 1209967657. The next prime is 1209967679. The reversal of 1209967668 is 8667699021.

It is an interprime number because it is at equal distance from previous prime (1209967657) and next prime (1209967679).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28383 + ... + 56793.

Almost surely, 2^1209967668 is an apocalyptic number.

1209967668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209967668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1892580144).

1209967668 is an abundant number, since it is smaller than the sum of its proper divisors (2575192620).

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

1209967668 is a wasteful number, since it uses less digits than its factorization.

1209967668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28454 (or 28436 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 1209967668 is about 34784.5895189235. The cubic root of 1209967668 is about 1065.5927454833.

The spelling of 1209967668 in words is "one billion, two hundred nine million, nine hundred sixty-seven thousand, six hundred sixty-eight".