3816897721 has 8 divisors (see below), whose sum is σ = 4697720384. Its totient is φ = 3019962960.

The previous prime is 3816897701. The next prime is 3816897739. The reversal of 3816897721 is 1277986183.

3816897721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3816897721 - 2⁹ = 3816897209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3816897701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20971875 + ... + 20972056.

It is an arithmetic number, because the mean of its divisors is an integer number (587215048).

Almost surely, 2^3816897721 is an apocalyptic number.

It is an amenable number.

3816897721 is a deficient number, since it is larger than the sum of its proper divisors (880822663).

3816897721 is a wasteful number, since it uses less digits than its factorization.

3816897721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41943951.

The product of its digits is 1016064, while the sum is 52.

The square root of 3816897721 is about 61781.0466162560. The cubic root of 3816897721 is about 1562.8003777583.

The spelling of 3816897721 in words is "three billion, eight hundred sixteen million, eight hundred ninety-seven thousand, seven hundred twenty-one".