1296225866 has 16 divisors (see below), whose sum is σ = 2204109600. Its totient is φ = 566770608.

The previous prime is 1296225803. The next prime is 1296225883. The reversal of 1296225866 is 6685226921.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1296225866.

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, 1311476 + ... + 1312463.

It is an arithmetic number, because the mean of its divisors is an integer number (137756850).

Almost surely, 2^1296225866 is an apocalyptic number.

1296225866 is a deficient number, since it is larger than the sum of its proper divisors (907883734).

1296225866 is a wasteful number, since it uses less digits than its factorization.

1296225866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623973.

The product of its digits is 622080, while the sum is 47.

The square root of 1296225866 is about 36003.1368911099. The cubic root of 1296225866 is about 1090.3356893288.

The spelling of 1296225866 in words is "one billion, two hundred ninety-six million, two hundred twenty-five thousand, eight hundred sixty-six".