1217980000 has 60 divisors (see below), whose sum is σ = 2996462700. Its totient is φ = 487184000.

The previous prime is 1217979953. The next prime is 1217980003. The reversal of 1217980000 is 897121.

1217980000 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217980003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10450 + ... + 50449.

It is an arithmetic number, because the mean of its divisors is an integer number (49941045).

Almost surely, 2^1217980000 is an apocalyptic number.

1217980000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217980000 is an abundant number, since it is smaller than the sum of its proper divisors (1778482700).

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

1217980000 is an frugal number, since it uses more digits than its factorization.

1217980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60929 (or 60906 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1217980000 is about 34899.5701979265. The cubic root of 1217980000 is about 1067.9396693793.

The spelling of 1217980000 in words is "one billion, two hundred seventeen million, nine hundred eighty thousand".