1913885220 has 96 divisors (see below), whose sum is σ = 5824304640. Its totient is φ = 466767360.

The previous prime is 1913885203. The next prime is 1913885221. The reversal of 1913885220 is 225883191.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1913885221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73765 + ... + 96275.

It is an arithmetic number, because the mean of its divisors is an integer number (60669840).

Almost surely, 2^1913885220 is an apocalyptic number.

1913885220 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 1913885220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2912152320).

1913885220 is an abundant number, since it is smaller than the sum of its proper divisors (3910419420).

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

1913885220 is a wasteful number, since it uses less digits than its factorization.

1913885220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22645 (or 22643 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 1913885220 is about 43747.9738959417. The cubic root of 1913885220 is about 1241.5721517375.

The spelling of 1913885220 in words is "one billion, nine hundred thirteen million, eight hundred eighty-five thousand, two hundred twenty".