945815399 has 2 divisors, whose sum is σ = 945815400. Its totient is φ = 945815398.

The previous prime is 945815389. The next prime is 945815419. The reversal of 945815399 is 993518549.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-945815399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 945815399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945815389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472907699 + 472907700.

It is an arithmetic number, because the mean of its divisors is an integer number (472907700).

Almost surely, 2^945815399 is an apocalyptic number.

945815399 is a deficient number, since it is larger than the sum of its proper divisors (1).

945815399 is an equidigital number, since it uses as much as digits as its factorization.

945815399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 53.

The square root of 945815399 is about 30754.1119039390. Note that the first 3 decimals coincide. The cubic root of 945815399 is about 981.6020578632.

The spelling of 945815399 in words is "nine hundred forty-five million, eight hundred fifteen thousand, three hundred ninety-nine".