102639973 has 4 divisors (see below), whose sum is σ = 102688768. Its totient is φ = 102591180.

The previous prime is 102639949. The next prime is 102639997. The reversal of 102639973 is 379936201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379936201 = 79 ⋅4809319.

It is an interprime number because it is at equal distance from previous prime (102639949) and next prime (102639997).

It is a cyclic number.

It is not a de Polignac number, because 102639973 - 2⁹ = 102639461 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 (102639923) 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 3 ways as a sum of consecutive naturals, for example, 21093 + ... + 25498.

It is an arithmetic number, because the mean of its divisors is an integer number (25672192).

Almost surely, 2^102639973 is an apocalyptic number.

It is an amenable number.

102639973 is a deficient number, since it is larger than the sum of its proper divisors (48795).

102639973 is an equidigital number, since it uses as much as digits as its factorization.

102639973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48794.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 102639973 is about 10131.1387810058. The cubic root of 102639973 is about 468.2080140991.

The spelling of 102639973 in words is "one hundred two million, six hundred thirty-nine thousand, nine hundred seventy-three".