1259942409 has 24 divisors (see below), whose sum is σ = 2005846752. Its totient is φ = 755723520.

The previous prime is 1259942399. The next prime is 1259942417. The reversal of 1259942409 is 9042499521.

1259942409 is a `hidden beast` number, since 12 + 599 + 4 + 2 + 40 + 9 = 666.

It is not a de Polignac number, because 1259942409 - 2¹⁶ = 1259876873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1259942419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55999 + ... + 75204.

It is an arithmetic number, because the mean of its divisors is an integer number (83576948).

Almost surely, 2^1259942409 is an apocalyptic number.

It is an amenable number.

1259942409 is a deficient number, since it is larger than the sum of its proper divisors (745904343).

1259942409 is a wasteful number, since it uses less digits than its factorization.

1259942409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131317 (or 131314 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1259942409 is about 35495.6674680164. The cubic root of 1259942409 is about 1080.0658421793.

The spelling of 1259942409 in words is "one billion, two hundred fifty-nine million, nine hundred forty-two thousand, four hundred nine".