420040 has 16 divisors (see below), whose sum is σ = 945180. Its totient is φ = 168000.

The previous prime is 420037. The next prime is 420041. The reversal of 420040 is 40024.

It can be written as a sum of positive squares in 2 ways, for example, as 407044 + 12996 = 638^2 + 114^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 419999 and 420026.

It is not an unprimeable number, because it can be changed into a prime (420041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5211 + ... + 5290.

2⁴²⁰⁰⁴⁰ is an apocalyptic number.

420040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420040 is an abundant number, since it is smaller than the sum of its proper divisors (525140).

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

420040 is a wasteful number, since it uses less digits than its factorization.

420040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512 (or 10508 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 420040 is about 648.1049297760. The cubic root of 420040 is about 74.8911012165.

Adding to 420040 its reverse (40024), we get a palindrome (460064).

The spelling of 420040 in words is "four hundred twenty thousand, forty", and thus it is an iban number.