1123420440 has 64 divisors (see below), whose sum is σ = 3372789600. Its totient is φ = 299354112.

The previous prime is 1123420427. The next prime is 1123420447. The reversal of 1123420440 is 440243211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123420447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212064 + ... + 217296.

Almost surely, 2^1123420440 is an apocalyptic number.

1123420440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123420440 is an abundant number, since it is smaller than the sum of its proper divisors (2249369160).

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

1123420440 is a wasteful number, since it uses less digits than its factorization.

1123420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036 (or 7032 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1123420440 is about 33517.4647012569. The cubic root of 1123420440 is about 1039.5549254324.

Adding to 1123420440 its reverse (440243211), we get a palindrome (1563663651).

The spelling of 1123420440 in words is "one billion, one hundred twenty-three million, four hundred twenty thousand, four hundred forty".