409687345 has 4 divisors (see below), whose sum is σ = 491624820. Its totient is φ = 327749872.

The previous prime is 409687331. The next prime is 409687363. The reversal of 409687345 is 543786904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 320875569 + 88811776 = 17913^2 + 9424^2 .

It is a cyclic number.

It is not a de Polignac number, because 409687345 - 2¹⁵ = 409654577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 409687295 and 409687304.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40968730 + ... + 40968739.

It is an arithmetic number, because the mean of its divisors is an integer number (122906205).

Almost surely, 2^409687345 is an apocalyptic number.

It is an amenable number.

409687345 is a deficient number, since it is larger than the sum of its proper divisors (81937475).

409687345 is an equidigital number, since it uses as much as digits as its factorization.

409687345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81937474.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 409687345 is about 20240.7347939743. The cubic root of 409687345 is about 742.7069986335.

The spelling of 409687345 in words is "four hundred nine million, six hundred eighty-seven thousand, three hundred forty-five".