1995519240 has 640 divisors, whose sum is σ = 8123068800. Its totient is φ = 432967680.

The previous prime is 1995519217. The next prime is 1995519247. The reversal of 1995519240 is 429155991.

1995519240 is a `hidden beast` number, since 1 + 9 + 9 + 551 + 92 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1995519247) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 27335844 + ... + 27335916.

It is an arithmetic number, because the mean of its divisors is an integer number (12692295).

Almost surely, 2^1995519240 is an apocalyptic number.

1995519240 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 1995519240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4061534400).

1995519240 is an abundant number, since it is smaller than the sum of its proper divisors (6127549560).

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

1995519240 is a wasteful number, since it uses less digits than its factorization.

1995519240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The square root of 1995519240 is about 44671.2350400120. The cubic root of 1995519240 is about 1258.9794457201.

The spelling of 1995519240 in words is "one billion, nine hundred ninety-five million, five hundred nineteen thousand, two hundred forty".