1221652726 has 32 divisors (see below), whose sum is σ = 2129218560. Its totient is φ = 514895616.

The previous prime is 1221652721. The next prime is 1221652727. The reversal of 1221652726 is 6272561221.

It is a junction number, because it is equal to n+sod(n) for n = 1221652691 and 1221652700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221652721) 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, 218595 + ... + 224113.

It is an arithmetic number, because the mean of its divisors is an integer number (66538080).

Almost surely, 2^1221652726 is an apocalyptic number.

1221652726 is a deficient number, since it is larger than the sum of its proper divisors (907565834).

1221652726 is a wasteful number, since it uses less digits than its factorization.

1221652726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788.

The product of its digits is 20160, while the sum is 34.

The square root of 1221652726 is about 34952.1490898628. The cubic root of 1221652726 is about 1069.0120225012.

The spelling of 1221652726 in words is "one billion, two hundred twenty-one million, six hundred fifty-two thousand, seven hundred twenty-six".