1223781672 has 32 divisors (see below), whose sum is σ = 3164954400. Its totient is φ = 393860544.

The previous prime is 1223781661. The next prime is 1223781673. The reversal of 1223781672 is 2761873221.

It is a self number, because there is not a number n which added to its sum of digits gives 1223781672.

It is not an unprimeable number, because it can be changed into a prime (1223781673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878458 + ... + 879849.

It is an arithmetic number, because the mean of its divisors is an integer number (98904825).

Almost surely, 2^1223781672 is an apocalyptic number.

1223781672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1223781672 is an abundant number, since it is smaller than the sum of its proper divisors (1941172728).

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

1223781672 is a wasteful number, since it uses less digits than its factorization.

1223781672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758345 (or 1758341 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 1223781672 is about 34982.5909846598. The cubic root of 1223781672 is about 1069.6326429838.

The spelling of 1223781672 in words is "one billion, two hundred twenty-three million, seven hundred eighty-one thousand, six hundred seventy-two".