3991523687900 has 288 divisors, whose sum is σ = 10732188096000. Its totient is φ = 1284355699200.

The previous prime is 3991523687891. The next prime is 3991523687903. The reversal of 3991523687900 is 97863251993.

It is a happy number.

It is a super-2 number, since 2×3991523687900² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991523687903) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 69703280 + ... + 69760520.

It is an arithmetic number, because the mean of its divisors is an integer number (37264542000).

Almost surely, 2^{3991523687900} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991523687900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5366094048000).

3991523687900 is an abundant number, since it is smaller than the sum of its proper divisors (6740664408100).

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

3991523687900 is a wasteful number, since it uses less digits than its factorization.

3991523687900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57402 (or 57381 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 62.

The spelling of 3991523687900 in words is "three trillion, nine hundred ninety-one billion, five hundred twenty-three million, six hundred eighty-seven thousand, nine hundred".