1438991232 has 192 divisors, whose sum is σ = 4591664640. Its totient is φ = 397716480.

The previous prime is 1438991167. The next prime is 1438991233. The reversal of 1438991232 is 2321998341.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438991233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 582063 + ... + 584529.

It is an arithmetic number, because the mean of its divisors is an integer number (23914920).

Almost surely, 2^1438991232 is an apocalyptic number.

1438991232 is a gapful number since it is divisible by the number (12) 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 1438991232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2295832320).

1438991232 is an abundant number, since it is smaller than the sum of its proper divisors (3152673408).

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

1438991232 is a wasteful number, since it uses less digits than its factorization.

1438991232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529 (or 2510 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 1438991232 is about 37934.0379079264. The cubic root of 1438991232 is about 1128.9794822161.

The spelling of 1438991232 in words is "one billion, four hundred thirty-eight million, nine hundred ninety-one thousand, two hundred thirty-two".