4078891 has 2 divisors, whose sum is σ = 4078892. Its totient is φ = 4078890.

The previous prime is 4078883. The next prime is 4078897. The reversal of 4078891 is 1988704.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4078891 - 2³ = 4078883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4078891.

It is not a weakly prime, because it can be changed into another prime (4078897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039445 + 2039446.

It is an arithmetic number, because the mean of its divisors is an integer number (2039446).

Almost surely, 2^4078891 is an apocalyptic number.

4078891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4078891 is an equidigital number, since it uses as much as digits as its factorization.

4078891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 4078891 is about 2019.6264506091. The cubic root of 4078891 is about 159.7769156657.

The spelling of 4078891 in words is "four million, seventy-eight thousand, eight hundred ninety-one".