3840391655 has 8 divisors (see below), whose sum is σ = 4636743792. Its totient is φ = 3053464128.

The previous prime is 3840391651. The next prime is 3840391679. The reversal of 3840391655 is 5561930483.

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

It is a cyclic number.

It is not a de Polignac number, because 3840391655 - 2² = 3840391651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3840391651) 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, 2355254 + ... + 2356883.

It is an arithmetic number, because the mean of its divisors is an integer number (579592974).

Almost surely, 2^3840391655 is an apocalyptic number.

3840391655 is a deficient number, since it is larger than the sum of its proper divisors (796352137).

3840391655 is a wasteful number, since it uses less digits than its factorization.

3840391655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712305.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 3840391655 is about 61970.8936114367. The cubic root of 3840391655 is about 1566.0002934592. Note that the first 3 decimals are identical.

The spelling of 3840391655 in words is "three billion, eight hundred forty million, three hundred ninety-one thousand, six hundred fifty-five".