421858520 has 32 divisors (see below), whose sum is σ = 999140400. Its totient is φ = 159861888.

The previous prime is 421858513. The next prime is 421858523. The reversal of 421858520 is 25858124.

It is a happy number.

It is a super-2 number, since 2×421858520² = 355929221793180800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421858523) 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, 276779 + ... + 278298.

Almost surely, 2^421858520 is an apocalyptic number.

421858520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421858520 is an abundant number, since it is smaller than the sum of its proper divisors (577281880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421858520 is a wasteful number, since it uses less digits than its factorization.

421858520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555107 (or 555103 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 421858520 is about 20539.1947261815. The cubic root of 421858520 is about 749.9902339469.

It can be divided in two parts, 42185 and 8520, that added together give a palindrome (50705).

The spelling of 421858520 in words is "four hundred twenty-one million, eight hundred fifty-eight thousand, five hundred twenty".