420213440 has 56 divisors (see below), whose sum is σ = 1027706352. Its totient is φ = 163537920.

The previous prime is 420213379. The next prime is 420213457. The reversal of 420213440 is 44312024.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5906 + ... + 29585.

Almost surely, 2^420213440 is an apocalyptic number.

420213440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420213440 is an abundant number, since it is smaller than the sum of its proper divisors (607492912).

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

420213440 is a wasteful number, since it uses less digits than its factorization.

420213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35545 (or 35535 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 420213440 is about 20499.1082732884. The cubic root of 420213440 is about 749.0140763592.

Adding to 420213440 its reverse (44312024), we get a palindrome (464525464).

The spelling of 420213440 in words is "four hundred twenty million, two hundred thirteen thousand, four hundred forty".