1213890000 has 200 divisors, whose sum is σ = 4013990112. Its totient is φ = 315840000.

The previous prime is 1213889977. The next prime is 1213890011. The reversal of 1213890000 is 983121.

It is a tau number, because it is divible by the number of its divisors (200).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1289530 + ... + 1290470.

Almost surely, 2^1213890000 is an apocalyptic number.

1213890000 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 1213890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2006995056).

1213890000 is an abundant number, since it is smaller than the sum of its proper divisors (2800100112).

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

1213890000 is an equidigital number, since it uses as much as digits as its factorization.

1213890000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1213890000 is about 34840.9242127702. The cubic root of 1213890000 is about 1066.7429415942.

The spelling of 1213890000 in words is "one billion, two hundred thirteen million, eight hundred ninety thousand".