1226890729 has 3 divisors (see below), whose sum is σ = 1226925757. Its totient is φ = 1226855702.

The previous prime is 1226890727. The next prime is 1226890747. The reversal of 1226890729 is 9270986221.

The square root of 1226890729 is 35027.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1226890729 - 2¹ = 1226890727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226890723) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17514 + ... + 52540.

Almost surely, 2^1226890729 is an apocalyptic number.

1226890729 is the 35027-th square number.

1226890729 is the 17514-th centered octagonal number.

It is an amenable number.

1226890729 is a deficient number, since it is larger than the sum of its proper divisors (35028).

1226890729 is an frugal number, since it uses more digits than its factorization.

1226890729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70054 (or 35027 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The cubic root of 1226890729 is about 1070.5376891149.

The spelling of 1226890729 in words is "one billion, two hundred twenty-six million, eight hundred ninety thousand, seven hundred twenty-nine".