1220923823 has 4 divisors (see below), whose sum is σ = 1395341520. Its totient is φ = 1046506128.

The previous prime is 1220923819. The next prime is 1220923829. The reversal of 1220923823 is 3283290221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3283290221 = 3659 ⋅897319.

It is a cyclic number.

It is not a de Polignac number, because 1220923823 - 2² = 1220923819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220923823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220923829) 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, 87208838 + ... + 87208851.

It is an arithmetic number, because the mean of its divisors is an integer number (348835380).

Almost surely, 2^1220923823 is an apocalyptic number.

1220923823 is a deficient number, since it is larger than the sum of its proper divisors (174417697).

1220923823 is an equidigital number, since it uses as much as digits as its factorization.

1220923823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174417696.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1220923823 is about 34941.7203783672. The cubic root of 1220923823 is about 1068.7993703901.

The spelling of 1220923823 in words is "one billion, two hundred twenty million, nine hundred twenty-three thousand, eight hundred twenty-three".