1995212520 has 384 divisors, whose sum is σ = 7840339200. Its totient is φ = 442091520.

The previous prime is 1995212503. The next prime is 1995212537. The reversal of 1995212520 is 252125991.

It is a happy number.

1995212520 is a `hidden beast` number, since 1 + 99 + 521 + 25 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1995212503) and next prime (1995212537).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12708282 + ... + 12708438.

It is an arithmetic number, because the mean of its divisors is an integer number (20417550).

Almost surely, 2^1995212520 is an apocalyptic number.

1995212520 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 1995212520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3920169600).

1995212520 is an abundant number, since it is smaller than the sum of its proper divisors (5845126680).

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

1995212520 is a wasteful number, since it uses less digits than its factorization.

1995212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 1995212520 is about 44667.8018263715. The cubic root of 1995212520 is about 1258.9149388733.

The spelling of 1995212520 in words is "one billion, nine hundred ninety-five million, two hundred twelve thousand, five hundred twenty".