1901865920 has 112 divisors (see below), whose sum is σ = 4689226080. Its totient is φ = 734232576.

The previous prime is 1901865881. The next prime is 1901865923. The reversal of 1901865920 is 295681091.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901865923) 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, 1223864 + ... + 1225416.

It is an arithmetic number, because the mean of its divisors is an integer number (41868090).

Almost surely, 2^1901865920 is an apocalyptic number.

1901865920 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 1901865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2344613040).

1901865920 is an abundant number, since it is smaller than the sum of its proper divisors (2787360160).

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

1901865920 is a wasteful number, since it uses less digits than its factorization.

1901865920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702 (or 1692 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1901865920 is about 43610.3877533782. The cubic root of 1901865920 is about 1238.9676457880.

The spelling of 1901865920 in words is "one billion, nine hundred one million, eight hundred sixty-five thousand, nine hundred twenty".