845921407 has 2 divisors, whose sum is σ = 845921408. Its totient is φ = 845921406.

The previous prime is 845921317. The next prime is 845921437. The reversal of 845921407 is 704129548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845921407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 845921407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845921437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422960703 + 422960704.

It is an arithmetic number, because the mean of its divisors is an integer number (422960704).

Almost surely, 2^845921407 is an apocalyptic number.

845921407 is a deficient number, since it is larger than the sum of its proper divisors (1).

845921407 is an equidigital number, since it uses as much as digits as its factorization.

845921407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 845921407 is about 29084.7280716186. The cubic root of 845921407 is about 945.7507008604.

The spelling of 845921407 in words is "eight hundred forty-five million, nine hundred twenty-one thousand, four hundred seven".