1438813044 has 90 divisors (see below), whose sum is σ = 3887430162. Its totient is φ = 464032800.

The previous prime is 1438813027. The next prime is 1438813063. The reversal of 1438813044 is 4403188341.

It can be written as a sum of positive squares in only one way, i.e., 1158585444 + 280227600 = 34038^2 + 16740^2 .

It is a super-3 number, since 3×1438813044³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 309054 + ... + 313674.

Almost surely, 2^1438813044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1438813044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943715081).

1438813044 is an abundant number, since it is smaller than the sum of its proper divisors (2448617118).

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

1438813044 is a wasteful number, since it uses less digits than its factorization.

1438813044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4699 (or 4657 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 1438813044 is about 37931.6891793656. The cubic root of 1438813044 is about 1128.9328803801.

The spelling of 1438813044 in words is "one billion, four hundred thirty-eight million, eight hundred thirteen thousand, forty-four".