1215540226 has 16 divisors (see below), whose sum is σ = 1873551744. Its totient is φ = 591182064.

The previous prime is 1215540203. The next prime is 1215540259. The reversal of 1215540226 is 6220455121.

It is a junction number, because it is equal to n+sod(n) for n = 1215540194 and 1215540203.

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, 24345 + ... + 54988.

It is an arithmetic number, because the mean of its divisors is an integer number (117096984).

Almost surely, 2^1215540226 is an apocalyptic number.

1215540226 is a deficient number, since it is larger than the sum of its proper divisors (658011518).

1215540226 is a wasteful number, since it uses less digits than its factorization.

1215540226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79545.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1215540226 is about 34864.5984631976. The cubic root of 1215540226 is about 1067.2261182213.

Adding to 1215540226 its reverse (6220455121), we get a palindrome (7435995347).

The spelling of 1215540226 in words is "one billion, two hundred fifteen million, five hundred forty thousand, two hundred twenty-six".