1221623746 has 32 divisors (see below), whose sum is σ = 2161199232. Its totient is φ = 506943360.

The previous prime is 1221623731. The next prime is 1221623747. The reversal of 1221623746 is 6473261221.

It is not an unprimeable number, because it can be changed into a prime (1221623747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103710 + ... + 114886.

It is an arithmetic number, because the mean of its divisors is an integer number (67537476).

Almost surely, 2^1221623746 is an apocalyptic number.

1221623746 is a deficient number, since it is larger than the sum of its proper divisors (939575486).

1221623746 is a wasteful number, since it uses less digits than its factorization.

1221623746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11434.

The product of its digits is 24192, while the sum is 34.

The square root of 1221623746 is about 34951.7345206214. The cubic root of 1221623746 is about 1069.0035694134.

Adding to 1221623746 its reverse (6473261221), we get a palindrome (7694884967).

It can be divided in two parts, 12 and 21623746, that multiplied together give a palindrome (259484952).

The spelling of 1221623746 in words is "one billion, two hundred twenty-one million, six hundred twenty-three thousand, seven hundred forty-six".