102172393 has 4 divisors (see below), whose sum is σ = 104100228. Its totient is φ = 100244560.

The previous prime is 102172391. The next prime is 102172403. The reversal of 102172393 is 393271201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73410624 + 28761769 = 8568^2 + 5363^2 .

It is a cyclic number.

It is not a de Polignac number, because 102172393 - 2¹ = 102172391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102172391) 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, 963838 + ... + 963943.

It is an arithmetic number, because the mean of its divisors is an integer number (26025057).

Almost surely, 2^102172393 is an apocalyptic number.

It is an amenable number.

102172393 is a deficient number, since it is larger than the sum of its proper divisors (1927835).

102172393 is an equidigital number, since it uses as much as digits as its factorization.

102172393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927834.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 102172393 is about 10108.0360604818. The cubic root of 102172393 is about 467.4959523800.

The spelling of 102172393 in words is "one hundred two million, one hundred seventy-two thousand, three hundred ninety-three".