4072978891 has 2 divisors, whose sum is σ = 4072978892. Its totient is φ = 4072978890.

The previous prime is 4072978883. The next prime is 4072978939. The reversal of 4072978891 is 1988792704.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4072978891 - 2³ = 4072978883 is a prime.

It is not a weakly prime, because it can be changed into another prime (4072975891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2036489445 + 2036489446.

It is an arithmetic number, because the mean of its divisors is an integer number (2036489446).

Almost surely, 2^4072978891 is an apocalyptic number.

4072978891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4072978891 is an equidigital number, since it uses as much as digits as its factorization.

4072978891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The square root of 4072978891 is about 63819.8941631839. The cubic root of 4072978891 is about 1596.9968263851.

The spelling of 4072978891 in words is "four billion, seventy-two million, nine hundred seventy-eight thousand, eight hundred ninety-one".