3997747895 has 4 divisors (see below), whose sum is σ = 4797297480. Its totient is φ = 3198198312.

The previous prime is 3997747861. The next prime is 3997747903. The reversal of 3997747895 is 5987477993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3997747895 - 2⁸ = 3997747639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399774785 + ... + 399774794.

It is an arithmetic number, because the mean of its divisors is an integer number (1199324370).

Almost surely, 2^3997747895 is an apocalyptic number.

3997747895 is a deficient number, since it is larger than the sum of its proper divisors (799549585).

3997747895 is an equidigital number, since it uses as much as digits as its factorization.

3997747895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799549584.

The product of its digits is 120022560, while the sum is 68.

The square root of 3997747895 is about 63227.7462432436. The cubic root of 3997747895 is about 1587.1030798853.

The spelling of 3997747895 in words is "three billion, nine hundred ninety-seven million, seven hundred forty-seven thousand, eight hundred ninety-five".