102099439 has 4 divisors (see below), whose sum is σ = 109953256. Its totient is φ = 94245624.

The previous prime is 102099427. The next prime is 102099469. The reversal of 102099439 is 934990201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934990201 = 79 ⋅11835319.

It is a cyclic number.

It is not a de Polignac number, because 102099439 - 2⁷ = 102099311 is a prime.

It is a super-2 number, since 2×102099439² = 20848590888229442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102099398 and 102099407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102099469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3926889 + ... + 3926914.

It is an arithmetic number, because the mean of its divisors is an integer number (27488314).

Almost surely, 2^102099439 is an apocalyptic number.

102099439 is a deficient number, since it is larger than the sum of its proper divisors (7853817).

102099439 is an equidigital number, since it uses as much as digits as its factorization.

102099439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7853816.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 102099439 is about 10104.4267031831. The cubic root of 102099439 is about 467.3846574094.

The spelling of 102099439 in words is "one hundred two million, ninety-nine thousand, four hundred thirty-nine".