215040426 has 16 divisors (see below), whose sum is σ = 430320000. Its totient is φ = 71640288.

The previous prime is 215040403. The next prime is 215040457. The reversal of 215040426 is 624040512.

It is a super-2 number, since 2×215040426² = 92484769628522952, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215040396 and 215040405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3030 + ... + 20958.

It is an arithmetic number, because the mean of its divisors is an integer number (26895000).

Almost surely, 2^215040426 is an apocalyptic number.

215040426 is an abundant number, since it is smaller than the sum of its proper divisors (215279574).

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

215040426 is a wasteful number, since it uses less digits than its factorization.

215040426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19933.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 215040426 is about 14664.2567489798. The cubic root of 215040426 is about 599.1101865947.

Adding to 215040426 its reverse (624040512), we get a palindrome (839080938).

The spelling of 215040426 in words is "two hundred fifteen million, forty thousand, four hundred twenty-six".