641426 has 4 divisors (see below), whose sum is σ = 962142. Its totient is φ = 320712.

The previous prime is 641419. The next prime is 641437. The reversal of 641426 is 624146.

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: 624146 = 2 ⋅312073.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 3025 = 799^2 + 55^2 .

It is a super-2 number, since 2×641426² = 822854626952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160355 + ... + 160358.

2⁶⁴¹⁴²⁶ is an apocalyptic number.

641426 is a deficient number, since it is larger than the sum of its proper divisors (320716).

641426 is a wasteful number, since it uses less digits than its factorization.

641426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320715.

The product of its digits is 1152, while the sum is 23.

The square root of 641426 is about 800.8907540982. The cubic root of 641426 is about 86.2413447872.

The spelling of 641426 in words is "six hundred forty-one thousand, four hundred twenty-six".