102142823 has 4 divisors (see below), whose sum is σ = 102164088. Its totient is φ = 102121560.

The previous prime is 102142771. The next prime is 102142837. The reversal of 102142823 is 328241201.

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: 328241201 = 503 ⋅652567.

It is a cyclic number.

It is not a de Polignac number, because 102142823 - 2⁸ = 102142567 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 (102142883) 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, 365 + ... + 14297.

It is an arithmetic number, because the mean of its divisors is an integer number (25541022).

Almost surely, 2^102142823 is an apocalyptic number.

102142823 is a deficient number, since it is larger than the sum of its proper divisors (21265).

102142823 is an equidigital number, since it uses as much as digits as its factorization.

102142823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21264.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 102142823 is about 10106.5732570442. The cubic root of 102142823 is about 467.4508482550.

The spelling of 102142823 in words is "one hundred two million, one hundred forty-two thousand, eight hundred twenty-three".