421440430 has 16 divisors (see below), whose sum is σ = 760122000. Its totient is φ = 168236352.

The previous prime is 421440427. The next prime is 421440433. The reversal of 421440430 is 34044124.

It is an interprime number because it is at equal distance from previous prime (421440427) and next prime (421440433).

It is a super-2 number, since 2×421440430² = 355224072077169800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421440433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37239 + ... + 47218.

It is an arithmetic number, because the mean of its divisors is an integer number (47507625).

Almost surely, 2^421440430 is an apocalyptic number.

421440430 is a deficient number, since it is larger than the sum of its proper divisors (338681570).

421440430 is a wasteful number, since it uses less digits than its factorization.

421440430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84963.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 421440430 is about 20529.0143455549. The cubic root of 421440430 is about 749.7423885623.

Adding to 421440430 its reverse (34044124), we get a palindrome (455484554).

It can be divided in two parts, 4214 and 40430, that added together give a palindrome (44644).

The spelling of 421440430 in words is "four hundred twenty-one million, four hundred forty thousand, four hundred thirty".