259999994 has 4 divisors (see below), whose sum is σ = 389999994. Its totient is φ = 129999996.

The previous prime is 259999991. The next prime is 260000011. The reversal of 259999994 is 499999952.

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

It can be written as a sum of positive squares in only one way, i.e., 244515769 + 15484225 = 15637^2 + 3935^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 259999994.

It is not an unprimeable number, because it can be changed into a prime (259999991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64999997 + ... + 65000000.

Almost surely, 2^259999994 is an apocalyptic number.

259999994 is a deficient number, since it is larger than the sum of its proper divisors (130000000).

259999994 is a wasteful number, since it uses less digits than its factorization.

259999994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129999999.

The product of its digits is 21257640, while the sum is 65.

The square root of 259999994 is about 16124.5153105450. The cubic root of 259999994 is about 638.2504249764.

The spelling of 259999994 in words is "two hundred fifty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".