259889138 has 4 divisors (see below), whose sum is σ = 389833710. Its totient is φ = 129944568.

The previous prime is 259889129. The next prime is 259889143. The reversal of 259889138 is 831988952.

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., 253350889 + 6538249 = 15917^2 + 2557^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 259889138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64972283 + ... + 64972286.

Almost surely, 2^259889138 is an apocalyptic number.

259889138 is a deficient number, since it is larger than the sum of its proper divisors (129944572).

259889138 is a wasteful number, since it uses less digits than its factorization.

259889138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129944571.

The product of its digits is 1244160, while the sum is 53.

The square root of 259889138 is about 16121.0774453819. The cubic root of 259889138 is about 638.1597019650.

The spelling of 259889138 in words is "two hundred fifty-nine million, eight hundred eighty-nine thousand, one hundred thirty-eight".