1213998520 has 96 divisors (see below), whose sum is σ = 3255169680. Its totient is φ = 406049280.

The previous prime is 1213998517. The next prime is 1213998523. The reversal of 1213998520 is 258993121.

It is an interprime number because it is at equal distance from previous prime (1213998517) and next prime (1213998523).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213998523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72807 + ... + 87913.

Almost surely, 2^1213998520 is an apocalyptic number.

1213998520 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 1213998520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627584840).

1213998520 is an abundant number, since it is smaller than the sum of its proper divisors (2041171160).

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

1213998520 is a wasteful number, since it uses less digits than its factorization.

1213998520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15173 (or 15162 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1213998520 is about 34842.4815419338. The cubic root of 1213998520 is about 1066.7747290694.

The spelling of 1213998520 in words is "one billion, two hundred thirteen million, nine hundred ninety-eight thousand, five hundred twenty".