1220951823 has 48 divisors (see below), whose sum is σ = 2084267520. Its totient is φ = 621758592.

The previous prime is 1220951807. The next prime is 1220951827. The reversal of 1220951823 is 3281590221.

It is a happy number.

It is not a de Polignac number, because 1220951823 - 2⁴ = 1220951807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220951827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96990 + ... + 108852.

It is an arithmetic number, because the mean of its divisors is an integer number (43422240).

Almost surely, 2^1220951823 is an apocalyptic number.

1220951823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220951823 is a deficient number, since it is larger than the sum of its proper divisors (863315697).

1220951823 is a wasteful number, since it uses less digits than its factorization.

1220951823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11928 (or 11915 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1220951823 is about 34942.1210432338. The cubic root of 1220951823 is about 1068.8075407480.

The spelling of 1220951823 in words is "one billion, two hundred twenty million, nine hundred fifty-one thousand, eight hundred twenty-three".