1223475989820 has 96 divisors (see below), whose sum is σ = 3916152403968. Its totient is φ = 279578138112.

The previous prime is 1223475989731. The next prime is 1223475989821. The reversal of 1223475989820 is 289895743221.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223475989821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1224672 + ... + 1986648.

It is an arithmetic number, because the mean of its divisors is an integer number (40793254208).

Almost surely, 2^{1223475989820} is an apocalyptic number.

1223475989820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223475989820 is an abundant number, since it is smaller than the sum of its proper divisors (2692676414148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223475989820 is a wasteful number, since it uses less digits than its factorization.

1223475989820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765819 (or 765817 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 1223475989820 in words is "one trillion, two hundred twenty-three billion, four hundred seventy-five million, nine hundred eighty-nine thousand, eight hundred twenty".