102402845 has 4 divisors (see below), whose sum is σ = 122883420. Its totient is φ = 81922272.

The previous prime is 102402821. The next prime is 102402847. The reversal of 102402845 is 548204201.

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: 548204201 = 599 ⋅915199.

It can be written as a sum of positive squares in 2 ways, for example, as 44368921 + 58033924 = 6661^2 + 7618^2 .

It is a cyclic number.

It is not a de Polignac number, because 102402845 - 2⁸ = 102402589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102402847) 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, 10240280 + ... + 10240289.

It is an arithmetic number, because the mean of its divisors is an integer number (30720855).

Almost surely, 2^102402845 is an apocalyptic number.

It is an amenable number.

102402845 is a deficient number, since it is larger than the sum of its proper divisors (20480575).

102402845 is an equidigital number, since it uses as much as digits as its factorization.

102402845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20480574.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 102402845 is about 10119.4290846865. The cubic root of 102402845 is about 467.8471707981.

The spelling of 102402845 in words is "one hundred two million, four hundred two thousand, eight hundred forty-five".