259640642 has 4 divisors (see below), whose sum is σ = 389460966. Its totient is φ = 129820320.

The previous prime is 259640621. The next prime is 259640663. The reversal of 259640642 is 246046952.

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

It is an interprime number because it is at equal distance from previous prime (259640621) and next prime (259640663).

It can be written as a sum of positive squares in only one way, i.e., 256288081 + 3352561 = 16009^2 + 1831^2 .

It is a junction number, because it is equal to n+sod(n) for n = 259640596 and 259640605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64910159 + ... + 64910162.

Almost surely, 2^259640642 is an apocalyptic number.

259640642 is a deficient number, since it is larger than the sum of its proper divisors (129820324).

259640642 is a wasteful number, since it uses less digits than its factorization.

259640642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129820323.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 259640642 is about 16113.3684250066. The cubic root of 259640642 is about 637.9562425154.

The spelling of 259640642 in words is "two hundred fifty-nine million, six hundred forty thousand, six hundred forty-two".