4120020391 has 4 divisors (see below), whose sum is σ = 4126808512. Its totient is φ = 4113232272.

The previous prime is 4120020371. The next prime is 4120020407. The reversal of 4120020391 is 1930200214.

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 4120020391 - 2²⁷ = 3985802663 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 (4120020371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3393150 + ... + 3394363.

It is an arithmetic number, because the mean of its divisors is an integer number (1031702128).

Almost surely, 2^4120020391 is an apocalyptic number.

4120020391 is a deficient number, since it is larger than the sum of its proper divisors (6788121).

4120020391 is an equidigital number, since it uses as much as digits as its factorization.

4120020391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6788120.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 4120020391 is about 64187.3849833439. The cubic root of 4120020391 is about 1603.1215610281.

The spelling of 4120020391 in words is "four billion, one hundred twenty million, twenty thousand, three hundred ninety-one".