642026 has 24 divisors (see below), whose sum is σ = 1212960. Its totient is φ = 249480.

The previous prime is 642013. The next prime is 642049. The reversal of 642026 is 620246.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 641989 and 642007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1505 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (50540).

2⁶⁴²⁰²⁶ is an apocalyptic number.

642026 is a deficient number, since it is larger than the sum of its proper divisors (570934).

642026 is a wasteful number, since it uses less digits than its factorization.

642026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 642026 is about 801.2652494649. The cubic root of 642026 is about 86.2682269117.

It can be divided in two parts, 6420 and 26, that added together give a palindrome (6446).

The spelling of 642026 in words is "six hundred forty-two thousand, twenty-six".