1227720634 has 16 divisors (see below), whose sum is σ = 2196171648. Its totient is φ = 503289072.

The previous prime is 1227720631. The next prime is 1227720661. The reversal of 1227720634 is 4360277221.

It is a self number, because there is not a number n which added to its sum of digits gives 1227720634.

It is not an unprimeable number, because it can be changed into a prime (1227720631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1906077 + ... + 1906720.

It is an arithmetic number, because the mean of its divisors is an integer number (137260728).

Almost surely, 2^1227720634 is an apocalyptic number.

1227720634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1227720634 is a deficient number, since it is larger than the sum of its proper divisors (968451014).

1227720634 is a wasteful number, since it uses less digits than its factorization.

1227720634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3812829.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 1227720634 is about 35038.8446441945. The cubic root of 1227720634 is about 1070.7790157768.

Adding to 1227720634 its reverse (4360277221), we get a palindrome (5587997855).

The spelling of 1227720634 in words is "one billion, two hundred twenty-seven million, seven hundred twenty thousand, six hundred thirty-four".