403845989 has 2 divisors, whose sum is σ = 403845990. Its totient is φ = 403845988.

The previous prime is 403845971. The next prime is 403845991. The reversal of 403845989 is 989548304.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269517889 + 134328100 = 16417^2 + 11590^2 .

It is a cyclic number.

It is not a de Polignac number, because 403845989 - 2¹⁶ = 403780453 is a prime.

Together with 403845991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403845289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201922994 + 201922995.

It is an arithmetic number, because the mean of its divisors is an integer number (201922995).

Almost surely, 2^403845989 is an apocalyptic number.

It is an amenable number.

403845989 is a deficient number, since it is larger than the sum of its proper divisors (1).

403845989 is an equidigital number, since it uses as much as digits as its factorization.

403845989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 403845989 is about 20095.9197102297. The cubic root of 403845989 is about 739.1602288859.

The spelling of 403845989 in words is "four hundred three million, eight hundred forty-five thousand, nine hundred eighty-nine".