4120781 has 4 divisors (see below), whose sum is σ = 4709472. Its totient is φ = 3532092.

The previous prime is 4120747. The next prime is 4120793. The reversal of 4120781 is 1870214.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1870214 = 2 ⋅935107.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4120781 is a prime.

It is a super-2 number, since 2×4120781² = 33961672099922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4120741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294335 + ... + 294348.

It is an arithmetic number, because the mean of its divisors is an integer number (1177368).

Almost surely, 2^4120781 is an apocalyptic number.

It is an amenable number.

4120781 is a deficient number, since it is larger than the sum of its proper divisors (588691).

4120781 is an equidigital number, since it uses as much as digits as its factorization.

4120781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588690.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 4120781 is about 2029.9706894436. The cubic root of 4120781 is about 160.3220207276.

Adding to 4120781 its reverse (1870214), we get a palindrome (5990995).

The spelling of 4120781 in words is "four million, one hundred twenty thousand, seven hundred eighty-one".