102639797 has 8 divisors (see below), whose sum is σ = 110680416. Its totient is φ = 94619952.

The previous prime is 102639781. The next prime is 102639799. The reversal of 102639797 is 797936201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102639797 - 2⁴ = 102639781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102639799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5978 + ... + 15524.

It is an arithmetic number, because the mean of its divisors is an integer number (13835052).

Almost surely, 2^102639797 is an apocalyptic number.

It is an amenable number.

102639797 is a deficient number, since it is larger than the sum of its proper divisors (8040619).

102639797 is an equidigital number, since it uses as much as digits as its factorization.

102639797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10387.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 102639797 is about 10131.1300949104. The cubic root of 102639797 is about 468.2077464819.

The spelling of 102639797 in words is "one hundred two million, six hundred thirty-nine thousand, seven hundred ninety-seven".