1423020440 has 16 divisors (see below), whose sum is σ = 3201796080. Its totient is φ = 569208160.

The previous prime is 1423020421. The next prime is 1423020449. The reversal of 1423020440 is 440203241.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423020449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17787716 + ... + 17787795.

It is an arithmetic number, because the mean of its divisors is an integer number (200112255).

Almost surely, 2^1423020440 is an apocalyptic number.

1423020440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423020440 is an abundant number, since it is smaller than the sum of its proper divisors (1778775640).

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

1423020440 is a wasteful number, since it uses less digits than its factorization.

1423020440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35575522 (or 35575518 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1423020440 is about 37722.9431513502. The cubic root of 1423020440 is about 1124.7872361425.

Adding to 1423020440 its reverse (440203241), we get a palindrome (1863223681).

The spelling of 1423020440 in words is "one billion, four hundred twenty-three million, twenty thousand, four hundred forty".