403399609 has 2 divisors, whose sum is σ = 403399610. Its totient is φ = 403399608.

The previous prime is 403399597. The next prime is 403399631. The reversal of 403399609 is 906993304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224910009 + 178489600 = 14997^2 + 13360^2 .

It is a cyclic number.

It is not a de Polignac number, because 403399609 - 2¹⁵ = 403366841 is a prime.

It is not a weakly prime, because it can be changed into another prime (403399639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201699804 + 201699805.

It is an arithmetic number, because the mean of its divisors is an integer number (201699805).

Almost surely, 2^403399609 is an apocalyptic number.

It is an amenable number.

403399609 is a deficient number, since it is larger than the sum of its proper divisors (1).

403399609 is an equidigital number, since it uses as much as digits as its factorization.

403399609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 43.

The square root of 403399609 is about 20084.8104048806. The cubic root of 403399609 is about 738.8877917091.

The spelling of 403399609 in words is "four hundred three million, three hundred ninety-nine thousand, six hundred nine".