102643426 has 4 divisors (see below), whose sum is σ = 153965142. Its totient is φ = 51321712.

The previous prime is 102643423. The next prime is 102643427. The reversal of 102643426 is 624346201.

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

It can be written as a sum of positive squares in only one way, i.e., 97002801 + 5640625 = 9849^2 + 2375^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102643394 and 102643403.

It is not an unprimeable number, because it can be changed into a prime (102643423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660855 + ... + 25660858.

Almost surely, 2^102643426 is an apocalyptic number.

102643426 is a deficient number, since it is larger than the sum of its proper divisors (51321716).

102643426 is an equidigital number, since it uses as much as digits as its factorization.

102643426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51321715.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 102643426 is about 10131.3091947685. The cubic root of 102643426 is about 468.2132645036.

Adding to 102643426 its reverse (624346201), we get a palindrome (726989627).

The spelling of 102643426 in words is "one hundred two million, six hundred forty-three thousand, four hundred twenty-six".