426721 has 8 divisors (see below), whose sum is σ = 462080. Its totient is φ = 392688.

The previous prime is 426709. The next prime is 426731. The reversal of 426721 is 127624.

426721 = T₁₃₃ + T₁₃₄ + ... + T₁₆₉.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 426692 and 426701.

It is not an unprimeable number, because it can be changed into a prime (426731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 1006.

It is an arithmetic number, because the mean of its divisors is an integer number (57760).

2⁴²⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

426721 is a deficient number, since it is larger than the sum of its proper divisors (35359).

426721 is a wasteful number, since it uses less digits than its factorization.

426721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

The product of its digits is 672, while the sum is 22.

The square root of 426721 is about 653.2388537128. The cubic root of 426721 is about 75.2860777764.

It can be divided in two parts, 42 and 6721, that multiplied together give a palindrome (282282).

The spelling of 426721 in words is "four hundred twenty-six thousand, seven hundred twenty-one".