1215402226 has 4 divisors (see below), whose sum is σ = 1823103342. Its totient is φ = 607701112.

The previous prime is 1215402197. The next prime is 1215402229. The reversal of 1215402226 is 6222045121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6222045121 = 19 ⋅327476059.

It can be written as a sum of positive squares in only one way, i.e., 1182328225 + 33074001 = 34385^2 + 5751^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1215402226.

It is not an unprimeable number, because it can be changed into a prime (1215402229) by changing a digit.

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, 303850555 + ... + 303850558.

Almost surely, 2^1215402226 is an apocalyptic number.

1215402226 is a deficient number, since it is larger than the sum of its proper divisors (607701116).

1215402226 is an equidigital number, since it uses as much as digits as its factorization.

1215402226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607701115.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1215402226 is about 34862.6193221336. The cubic root of 1215402226 is about 1067.1857293816.

Adding to 1215402226 its reverse (6222045121), we get a palindrome (7437447347).

The spelling of 1215402226 in words is "one billion, two hundred fifteen million, four hundred two thousand, two hundred twenty-six".