215420 has 12 divisors (see below), whose sum is σ = 452424. Its totient is φ = 86160.

The previous prime is 215417. The next prime is 215443. The reversal of 215420 is 24512.

It is a junction number, because it is equal to n+sod(n) for n = 215395 and 215404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5366 + ... + 5405.

It is an arithmetic number, because the mean of its divisors is an integer number (37702).

2²¹⁵⁴²⁰ is an apocalyptic number.

215420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215420 is an abundant number, since it is smaller than the sum of its proper divisors (237004).

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

215420 is a wasteful number, since it uses less digits than its factorization.

215420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10780 (or 10778 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 215420 is about 464.1336014554. The cubic root of 215420 is about 59.9462481563.

Adding to 215420 its reverse (24512), we get a palindrome (239932).

The spelling of 215420 in words is "two hundred fifteen thousand, four hundred twenty".