1438915500 has 288 divisors, whose sum is σ = 5079896640. Its totient is φ = 339840000.

The previous prime is 1438915487. The next prime is 1438915507. The reversal of 1438915500 is 55198341.

1438915500 is a `hidden beast` number, since 14 + 3 + 8 + 91 + 550 + 0 = 666.

It is a super-2 number, since 2×1438915500² = 4140955632280500000, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1438915507) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2029146 + ... + 2029854.

It is an arithmetic number, because the mean of its divisors is an integer number (17638530).

Almost surely, 2^1438915500 is an apocalyptic number.

1438915500 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 1438915500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2539948320).

1438915500 is an abundant number, since it is smaller than the sum of its proper divisors (3640981140).

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

1438915500 is a wasteful number, since it uses less digits than its factorization.

1438915500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1438915500 is about 37933.0396883772. The cubic root of 1438915500 is about 1128.9596763567.

The spelling of 1438915500 in words is "one billion, four hundred thirty-eight million, nine hundred fifteen thousand, five hundred".