1670398259 has 4 divisors (see below), whose sum is σ = 1670483520. Its totient is φ = 1670313000.

The previous prime is 1670398211. The next prime is 1670398313. The reversal of 1670398259 is 9528930761.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9528930761 = 7 ⋅1361275823.

It is a cyclic number.

It is not a de Polignac number, because 1670398259 - 2²⁸ = 1401962803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1670398159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3134 + ... + 57884.

It is an arithmetic number, because the mean of its divisors is an integer number (417620880).

Almost surely, 2^1670398259 is an apocalyptic number.

1670398259 is a deficient number, since it is larger than the sum of its proper divisors (85261).

1670398259 is an equidigital number, since it uses as much as digits as its factorization.

1670398259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85260.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 1670398259 is about 40870.5059792511. The cubic root of 1670398259 is about 1186.5153003164.

The spelling of 1670398259 in words is "one billion, six hundred seventy million, three hundred ninety-eight thousand, two hundred fifty-nine".