1438773840 has 480 divisors, whose sum is σ = 5838792960. Its totient is φ = 322486272.

The previous prime is 1438773827. The next prime is 1438773899. The reversal of 1438773840 is 483778341.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13199706 + ... + 13199814.

It is an arithmetic number, because the mean of its divisors is an integer number (12164152).

Almost surely, 2^1438773840 is an apocalyptic number.

1438773840 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 1438773840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2919396480).

1438773840 is an abundant number, since it is smaller than the sum of its proper divisors (4400019120).

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

1438773840 is a wasteful number, since it uses less digits than its factorization.

1438773840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 1438773840 is about 37931.1724047649. The cubic root of 1438773840 is about 1128.9226267694.

The spelling of 1438773840 in words is "one billion, four hundred thirty-eight million, seven hundred seventy-three thousand, eight hundred forty".