3781955609 has 16 divisors (see below), whose sum is σ = 4089864960. Its totient is φ = 3483866880.

The previous prime is 3781955591. The next prime is 3781955621. The reversal of 3781955609 is 9065591873.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3781955609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3781955659) 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, 383462 + ... + 393200.

It is an arithmetic number, because the mean of its divisors is an integer number (255616560).

Almost surely, 2^3781955609 is an apocalyptic number.

It is an amenable number.

3781955609 is a deficient number, since it is larger than the sum of its proper divisors (307909351).

3781955609 is a wasteful number, since it uses less digits than its factorization.

3781955609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The square root of 3781955609 is about 61497.6065306610. The cubic root of 3781955609 is about 1558.0168214954.

The spelling of 3781955609 in words is "three billion, seven hundred eighty-one million, nine hundred fifty-five thousand, six hundred nine".