420388 has 6 divisors (see below), whose sum is σ = 735686. Its totient is φ = 210192.

The previous prime is 420383. The next prime is 420397. The reversal of 420388 is 883024.

It can be written as a sum of positive squares in only one way, i.e., 419904 + 484 = 648^2 + 22^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (420383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52545 + ... + 52552.

2⁴²⁰³⁸⁸ is an apocalyptic number.

It is an amenable number.

420388 is a deficient number, since it is larger than the sum of its proper divisors (315298).

420388 is a wasteful number, since it uses less digits than its factorization.

420388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105101 (or 105099 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 420388 is about 648.3733492364. The cubic root of 420388 is about 74.9117777466.

It can be divided in two parts, 420 and 388, that added together give a palindrome (808).

The spelling of 420388 in words is "four hundred twenty thousand, three hundred eighty-eight".