3998264188356 has 81 divisors (see below), whose sum is σ = 10495760611791. Its totient is φ = 1332646752888.

The previous prime is 3998264188351. The next prime is 3998264188357. The reversal of 3998264188356 is 6538814628993.

It is a happy number.

The square root of 3998264188356 is 1999566.

It is a perfect power (a square), and thus also a powerful number.

3998264188356 is a `hidden beast` number, since 3 + 9 + 9 + 8 + 264 + 1 + 8 + 8 + 356 = 666.

It is a tau number, because it is divible by the number of its divisors (81).

It is a super-2 number, since 2×3998264188356² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3998264188351) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 323923521 + ... + 323935863.

Almost surely, 2^{3998264188356} is an apocalyptic number.

3998264188356 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

3998264188356 is the 1999566-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3998264188356

3998264188356 is an abundant number, since it is smaller than the sum of its proper divisors (6497496423435).

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

3998264188356 is an frugal number, since it uses more digits than its factorization.

3998264188356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24714 (or 12348 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 72.

The spelling of 3998264188356 in words is "three trillion, nine hundred ninety-eight billion, two hundred sixty-four million, one hundred eighty-eight thousand, three hundred fifty-six".