521420434 has 16 divisors (see below), whose sum is σ = 812793600. Its totient is φ = 250602480.

The previous prime is 521420429. The next prime is 521420437. The reversal of 521420434 is 434024125.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 521420399 and 521420408.

It is not an unprimeable number, because it can be changed into a prime (521420437) 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, 18984 + ... + 37459.

It is an arithmetic number, because the mean of its divisors is an integer number (50799600).

Almost surely, 2^521420434 is an apocalyptic number.

521420434 is a deficient number, since it is larger than the sum of its proper divisors (291373166).

521420434 is a wasteful number, since it uses less digits than its factorization.

521420434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56625.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 521420434 is about 22834.6323377452. The cubic root of 521420434 is about 804.8766880289.

Adding to 521420434 its reverse (434024125), we get a palindrome (955444559).

The spelling of 521420434 in words is "five hundred twenty-one million, four hundred twenty thousand, four hundred thirty-four".