1438545940 has 96 divisors (see below), whose sum is σ = 3360984480. Its totient is φ = 513755136.

The previous prime is 1438545937. The next prime is 1438545949. The reversal of 1438545940 is 495458341.

It can be written as a sum of positive squares in 16 ways, for example, as 135769104 + 1302776836 = 11652^2 + 36094^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438545949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2202654 + ... + 2203306.

It is an arithmetic number, because the mean of its divisors is an integer number (35010255).

Almost surely, 2^1438545940 is an apocalyptic number.

1438545940 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 1438545940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680492240).

1438545940 is an abundant number, since it is smaller than the sum of its proper divisors (1922438540).

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

1438545940 is a wasteful number, since it uses less digits than its factorization.

1438545940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1438545940 is about 37928.1681603528. The cubic root of 1438545940 is about 1128.8630169718.

The spelling of 1438545940 in words is "one billion, four hundred thirty-eight million, five hundred forty-five thousand, nine hundred forty".