215426 has 4 divisors (see below), whose sum is σ = 323142. Its totient is φ = 107712.

The previous prime is 215417. The next prime is 215443. The reversal of 215426 is 624512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 126025 + 89401 = 355^2 + 299^2 .

It is a super-2 number, since 2×215426² = 92816722952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215398 and 215407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53855 + ... + 53858.

2²¹⁵⁴²⁶ is an apocalyptic number.

215426 is a deficient number, since it is larger than the sum of its proper divisors (107716).

215426 is a wasteful number, since it uses less digits than its factorization.

215426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107715.

The product of its digits is 480, while the sum is 20.

The square root of 215426 is about 464.1400650666. The cubic root of 215426 is about 59.9468047035.

Adding to 215426 its reverse (624512), we get a palindrome (839938).

The spelling of 215426 in words is "two hundred fifteen thousand, four hundred twenty-six".