1226809965 has 16 divisors (see below), whose sum is σ = 2026215936. Its totient is φ = 633192000.

The previous prime is 1226809957. The next prime is 1226810017. The reversal of 1226809965 is 5699086221.

It is not a de Polignac number, because 1226809965 - 2³ = 1226809957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1318686 + ... + 1319615.

It is an arithmetic number, because the mean of its divisors is an integer number (126638496).

Almost surely, 2^1226809965 is an apocalyptic number.

1226809965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1226809965 is a deficient number, since it is larger than the sum of its proper divisors (799405971).

1226809965 is a wasteful number, since it uses less digits than its factorization.

1226809965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638340.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 1226809965 is about 35025.8470989639. The cubic root of 1226809965 is about 1070.5141980788.

The spelling of 1226809965 in words is "one billion, two hundred twenty-six million, eight hundred nine thousand, nine hundred sixty-five".