102804139 has 4 divisors (see below), whose sum is σ = 102970840. Its totient is φ = 102637440.

The previous prime is 102804133. The next prime is 102804161. The reversal of 102804139 is 931408201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931408201 = 4903 ⋅189967.

It is a cyclic number.

It is not a de Polignac number, because 102804139 - 2⁷ = 102804011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102804133) 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, 82422 + ... + 83659.

It is an arithmetic number, because the mean of its divisors is an integer number (25742710).

Almost surely, 2^102804139 is an apocalyptic number.

102804139 is a deficient number, since it is larger than the sum of its proper divisors (166701).

102804139 is an equidigital number, since it uses as much as digits as its factorization.

102804139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166700.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 102804139 is about 10139.2375946123. The cubic root of 102804139 is about 468.4575039466.

The spelling of 102804139 in words is "one hundred two million, eight hundred four thousand, one hundred thirty-nine".