1212990000 has 100 divisors (see below), whose sum is σ = 3915790296. Its totient is φ = 323456000.

The previous prime is 1212989983. The next prime is 1212990013. The reversal of 1212990000 is 992121.

It is a tau number, because it is divible by the number of its divisors (100).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9784 + ... + 50216.

Almost surely, 2^1212990000 is an apocalyptic number.

1212990000 is a gapful number since it is divisible by the number (10) 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 1212990000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957895148).

1212990000 is an abundant number, since it is smaller than the sum of its proper divisors (2702800296).

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

1212990000 is an equidigital number, since it uses as much as digits as its factorization.

1212990000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40464 (or 40443 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1212990000 is about 34828.0059722058. The cubic root of 1212990000 is about 1066.4792422431.

The spelling of 1212990000 in words is "one billion, two hundred twelve million, nine hundred ninety thousand".