1913138620 has 48 divisors (see below), whose sum is σ = 4203601920. Its totient is φ = 730005056.

The previous prime is 1913138609. The next prime is 1913138621. The reversal of 1913138620 is 268313191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913138621) 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, 170751 + ... + 181609.

It is an arithmetic number, because the mean of its divisors is an integer number (87575040).

Almost surely, 2^1913138620 is an apocalyptic number.

1913138620 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 1913138620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2101800960).

1913138620 is an abundant number, since it is smaller than the sum of its proper divisors (2290463300).

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

1913138620 is a wasteful number, since it uses less digits than its factorization.

1913138620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11274 (or 11272 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1913138620 is about 43739.4400970108. The cubic root of 1913138620 is about 1241.4106864070.

The spelling of 1913138620 in words is "one billion, nine hundred thirteen million, one hundred thirty-eight thousand, six hundred twenty".