521680426 has 16 divisors (see below), whose sum is σ = 791519040. Its totient is φ = 257851360.

The previous prime is 521680421. The next prime is 521680447. The reversal of 521680426 is 624086125.

It is a junction number, because it is equal to n+sod(n) for n = 521680391 and 521680400.

It is not an unprimeable number, because it can be changed into a prime (521680421) 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, 109155 + ... + 113833.

It is an arithmetic number, because the mean of its divisors is an integer number (49469940).

Almost surely, 2^521680426 is an apocalyptic number.

521680426 is a deficient number, since it is larger than the sum of its proper divisors (269838614).

521680426 is a wasteful number, since it uses less digits than its factorization.

521680426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 521680426 is about 22840.3245598656. The cubic root of 521680426 is about 805.0104423629.

The spelling of 521680426 in words is "five hundred twenty-one million, six hundred eighty thousand, four hundred twenty-six".