1226720003 has 4 divisors (see below), whose sum is σ = 1266291648. Its totient is φ = 1187148360.

The previous prime is 1226719987. The next prime is 1226720023. The reversal of 1226720003 is 3000276221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3000276221 = 113 ⋅26551117.

It is a cyclic number.

It is not a de Polignac number, because 1226720003 - 2⁴ = 1226719987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226720023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19785776 + ... + 19785837.

It is an arithmetic number, because the mean of its divisors is an integer number (316572912).

Almost surely, 2^1226720003 is an apocalyptic number.

1226720003 is a deficient number, since it is larger than the sum of its proper divisors (39571645).

1226720003 is an equidigital number, since it uses as much as digits as its factorization.

1226720003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39571644.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1226720003 is about 35024.5628523755. The cubic root of 1226720003 is about 1070.4880304964.

Adding to 1226720003 its reverse (3000276221), we get a palindrome (4226996224).

The spelling of 1226720003 in words is "one billion, two hundred twenty-six million, seven hundred twenty thousand, three".