1123999780 has 24 divisors (see below), whose sum is σ = 2369594808. Its totient is φ = 447848448.

The previous prime is 1123999771. The next prime is 1123999787. The reversal of 1123999780 is 879993211.

It can be written as a sum of positive squares in 4 ways, for example, as 755590144 + 368409636 = 27488^2 + 19194^2 .

It is not an unprimeable number, because it can be changed into a prime (1123999787) 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, 104199 + ... + 114478.

It is an arithmetic number, because the mean of its divisors is an integer number (98733117).

Almost surely, 2^1123999780 is an apocalyptic number.

1123999780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123999780 is an abundant number, since it is smaller than the sum of its proper divisors (1245595028).

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

1123999780 is a wasteful number, since it uses less digits than its factorization.

1123999780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218943 (or 218941 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 1123999780 is about 33526.1059474553. The cubic root of 1123999780 is about 1039.7335917721.

The spelling of 1123999780 in words is "one billion, one hundred twenty-three million, nine hundred ninety-nine thousand, seven hundred eighty".