1213795520 has 112 divisors (see below), whose sum is σ = 3312249408. Its totient is φ = 415027200.

The previous prime is 1213795501. The next prime is 1213795523. The reversal of 1213795520 is 255973121.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1213795523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569854 + ... + 1570626.

Almost surely, 2^1213795520 is an apocalyptic number.

1213795520 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 1213795520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1656124704).

1213795520 is an abundant number, since it is smaller than the sum of its proper divisors (2098453888).

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

1213795520 is an equidigital number, since it uses as much as digits as its factorization.

1213795520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1213795520 is about 34839.5683096103. The cubic root of 1213795520 is about 1066.7152651469.

The spelling of 1213795520 in words is "one billion, two hundred thirteen million, seven hundred ninety-five thousand, five hundred twenty".