7409891 has 2 divisors, whose sum is σ = 7409892. Its totient is φ = 7409890.

The previous prime is 7409863. The next prime is 7409893. The reversal of 7409891 is 1989047.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7409891 - 2⁶ = 7409827 is a prime.

Together with 7409893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7409893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3704945 + 3704946.

It is an arithmetic number, because the mean of its divisors is an integer number (3704946).

Almost surely, 2^7409891 is an apocalyptic number.

7409891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7409891 is an equidigital number, since it uses as much as digits as its factorization.

7409891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7409891 is about 2722.1114966143. Note that the first 3 decimals coincide. The cubic root of 7409891 is about 194.9562996528.

The spelling of 7409891 in words is "seven million, four hundred nine thousand, eight hundred ninety-one".