245799987 has 4 divisors (see below), whose sum is σ = 327733320. Its totient is φ = 163866656.

The previous prime is 245799943. The next prime is 245800007. The reversal of 245799987 is 789997542.

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

It is a cyclic number.

It is not a de Polignac number, because 245799987 - 2¹⁵ = 245767219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245799987.

It is not an unprimeable number, because it can be changed into a prime (245799937) 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, 40966662 + ... + 40966667.

It is an arithmetic number, because the mean of its divisors is an integer number (81933330).

Almost surely, 2^245799987 is an apocalyptic number.

245799987 is a deficient number, since it is larger than the sum of its proper divisors (81933333).

245799987 is an equidigital number, since it uses as much as digits as its factorization.

245799987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81933332.

The product of its digits is 11430720, while the sum is 60.

The square root of 245799987 is about 15678.0096632194. The cubic root of 245799987 is about 626.4127929262.

The spelling of 245799987 in words is "two hundred forty-five million, seven hundred ninety-nine thousand, nine hundred eighty-seven".