1403423440 has 80 divisors (see below), whose sum is σ = 3539304720. Its totient is φ = 515440640.

The previous prime is 1403423393. The next prime is 1403423443. The reversal of 1403423440 is 443243041.

It can be written as a sum of positive squares in 8 ways, for example, as 157051024 + 1246372416 = 12532^2 + 35304^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1403423443) 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, 43176 + ... + 68344.

It is an arithmetic number, because the mean of its divisors is an integer number (44241309).

Almost surely, 2^1403423440 is an apocalyptic number.

1403423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1403423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769652360).

1403423440 is an abundant number, since it is smaller than the sum of its proper divisors (2135881280).

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

1403423440 is a wasteful number, since it uses less digits than its factorization.

1403423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25240 (or 25234 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 1403423440 is about 37462.2935763415. The cubic root of 1403423440 is about 1119.6000485210.

Adding to 1403423440 its reverse (443243041), we get a palindrome (1846666481).

The spelling of 1403423440 in words is "one billion, four hundred three million, four hundred twenty-three thousand, four hundred forty".