3680181921 has 16 divisors (see below), whose sum is σ = 5396799744. Its totient is φ = 2216540544.

The previous prime is 3680181919. The next prime is 3680181943. The reversal of 3680181921 is 1291810863.

It is not a de Polignac number, because 3680181921 - 2¹ = 3680181919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 3680181921.

It is not an unprimeable number, because it can be changed into a prime (3680181121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002036 + ... + 1005701.

It is an arithmetic number, because the mean of its divisors is an integer number (337299984).

Almost surely, 2^3680181921 is an apocalyptic number.

It is an amenable number.

3680181921 is a deficient number, since it is larger than the sum of its proper divisors (1716617823).

3680181921 is a wasteful number, since it uses less digits than its factorization.

3680181921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007800.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 3680181921 is about 60664.5029733204. The cubic root of 3680181921 is about 1543.9139661908.

The spelling of 3680181921 in words is "three billion, six hundred eighty million, one hundred eighty-one thousand, nine hundred twenty-one".