1236540226 has 4 divisors (see below), whose sum is σ = 1854810342. Its totient is φ = 618270112.

The previous prime is 1236540161. The next prime is 1236540269. The reversal of 1236540226 is 6220456321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6220456321 = 149 ⋅41748029.

It can be written as a sum of positive squares in only one way, i.e., 1030474201 + 206066025 = 32101^2 + 14355^2 .

It is a super-2 number, since 2×1236540226² = 3058063461032262152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309135055 + ... + 309135058.

Almost surely, 2^1236540226 is an apocalyptic number.

1236540226 is a deficient number, since it is larger than the sum of its proper divisors (618270116).

1236540226 is an equidigital number, since it uses as much as digits as its factorization.

1236540226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618270115.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1236540226 is about 35164.4739189996. The cubic root of 1236540226 is about 1073.3369565309.

Adding to 1236540226 its reverse (6220456321), we get a palindrome (7456996547).

The spelling of 1236540226 in words is "one billion, two hundred thirty-six million, five hundred forty thousand, two hundred twenty-six".