1438729732440 has 384 divisors, whose sum is σ = 6278094950400. Its totient is φ = 275960079360.

The previous prime is 1438729732409. The next prime is 1438729732457. The reversal of 1438729732440 is 442379278341.

1438729732440 is a `hidden beast` number, since 1 + 4 + 3 + 87 + 2 + 97 + 32 + 440 = 666.

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, 1635880 + ... + 2356599.

It is an arithmetic number, because the mean of its divisors is an integer number (16349205600).

Almost surely, 2^{1438729732440} is an apocalyptic number.

1438729732440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438729732440 is an abundant number, since it is smaller than the sum of its proper divisors (4839365217960).

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

1438729732440 is a wasteful number, since it uses less digits than its factorization.

1438729732440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992527 (or 3992520 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 1438729732440 in words is "one trillion, four hundred thirty-eight billion, seven hundred twenty-nine million, seven hundred thirty-two thousand, four hundred forty".