1859721948 has 144 divisors (see below), whose sum is σ = 5690979840. Its totient is φ = 500556672.

The previous prime is 1859721943. The next prime is 1859721977. The reversal of 1859721948 is 8491279581.

It is a happy number.

1859721948 is a `hidden beast` number, since 1 + 8 + 597 + 2 + 1 + 9 + 48 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1859721894 and 1859721903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1859721943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 385938 + ... + 390726.

Almost surely, 2^1859721948 is an apocalyptic number.

1859721948 is a gapful number since it is divisible by the number (18) 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 1859721948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2845489920).

1859721948 is an abundant number, since it is smaller than the sum of its proper divisors (3831257892).

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

1859721948 is a wasteful number, since it uses less digits than its factorization.

1859721948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896 (or 4891 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 1859721948 is about 43124.4935970267. The cubic root of 1859721948 is about 1229.7476618981.

The spelling of 1859721948 in words is "one billion, eight hundred fifty-nine million, seven hundred twenty-one thousand, nine hundred forty-eight".