102868639 has 4 divisors (see below), whose sum is σ = 103204024. Its totient is φ = 102533256.

The previous prime is 102868637. The next prime is 102868657. The reversal of 102868639 is 936868201.

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 102868639 - 2¹ = 102868637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102868595 and 102868604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102868637) 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, 167232 + ... + 167845.

It is an arithmetic number, because the mean of its divisors is an integer number (25801006).

Almost surely, 2^102868639 is an apocalyptic number.

102868639 is a deficient number, since it is larger than the sum of its proper divisors (335385).

102868639 is an equidigital number, since it uses as much as digits as its factorization.

102868639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335384.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 102868639 is about 10142.4178083926. The cubic root of 102868639 is about 468.5554545815. Note that the first 3 decimals are identical.

The spelling of 102868639 in words is "one hundred two million, eight hundred sixty-eight thousand, six hundred thirty-nine".