259640389 has 4 divisors (see below), whose sum is σ = 260348224. Its totient is φ = 258932556.

The previous prime is 259640363. The next prime is 259640419. The reversal of 259640389 is 983046952.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 259640389 - 2¹⁹ = 259116101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259640089) 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, 353367 + ... + 354100.

It is an arithmetic number, because the mean of its divisors is an integer number (65087056).

Almost surely, 2^259640389 is an apocalyptic number.

It is an amenable number.

259640389 is a deficient number, since it is larger than the sum of its proper divisors (707835).

259640389 is an equidigital number, since it uses as much as digits as its factorization.

259640389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707834.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 259640389 is about 16113.3605743805. The cubic root of 259640389 is about 637.9560353021.

The spelling of 259640389 in words is "two hundred fifty-nine million, six hundred forty thousand, three hundred eighty-nine".