420504140 has 48 divisors (see below), whose sum is σ = 1015456512. Its totient is φ = 143280576.

The previous prime is 420504131. The next prime is 420504169. The reversal of 420504140 is 41405024.

It is a super-3 number, since 3×420504140³ (a number of 27 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13607 + ... + 32033.

It is an arithmetic number, because the mean of its divisors is an integer number (21155344).

Almost surely, 2^420504140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420504140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (507728256).

420504140 is an abundant number, since it is smaller than the sum of its proper divisors (594952372).

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

420504140 is a wasteful number, since it uses less digits than its factorization.

420504140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18606 (or 18604 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 420504140 is about 20506.1975997502. The cubic root of 420504140 is about 749.1867570184.

Adding to 420504140 its reverse (41405024), we get a palindrome (461909164).

The spelling of 420504140 in words is "four hundred twenty million, five hundred four thousand, one hundred forty".