9945437389 has 2 divisors, whose sum is σ = 9945437390. Its totient is φ = 9945437388.

The previous prime is 9945437309. The next prime is 9945437407. The reversal of 9945437389 is 9837345499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8724494025 + 1220943364 = 93405^2 + 34942^2 .

It is a cyclic number.

It is not a de Polignac number, because 9945437389 - 2²⁷ = 9811219661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9945437309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972718694 + 4972718695.

It is an arithmetic number, because the mean of its divisors is an integer number (4972718695).

Almost surely, 2^9945437389 is an apocalyptic number.

It is an amenable number.

9945437389 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945437389 is an equidigital number, since it uses as much as digits as its factorization.

9945437389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 61.

The square root of 9945437389 is about 99726.8137914774. The cubic root of 9945437389 is about 2150.5091557074.

The spelling of 9945437389 in words is "nine billion, nine hundred forty-five million, four hundred thirty-seven thousand, three hundred eighty-nine".