102318638 has 4 divisors (see below), whose sum is σ = 153477960. Its totient is φ = 51159318.

The previous prime is 102318637. The next prime is 102318647. The reversal of 102318638 is 836813201.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102318637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25579658 + ... + 25579661.

It is an arithmetic number, because the mean of its divisors is an integer number (38369490).

Almost surely, 2^102318638 is an apocalyptic number.

102318638 is a deficient number, since it is larger than the sum of its proper divisors (51159322).

102318638 is an equidigital number, since it uses as much as digits as its factorization.

102318638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51159321.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 102318638 is about 10115.2675693725. The cubic root of 102318638 is about 467.7188969849.

The spelling of 102318638 in words is "one hundred two million, three hundred eighteen thousand, six hundred thirty-eight".