1438587381 has 16 divisors (see below), whose sum is σ = 2391418368. Its totient is φ = 747318000.

The previous prime is 1438587331. The next prime is 1438587407. The reversal of 1438587381 is 1837858341.

It is a happy number.

It is not a de Polignac number, because 1438587381 - 2¹³ = 1438579189 is a prime.

It is a super-2 number, since 2×1438587381² = 4139067305544878322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1438587381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438587331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3113595 + ... + 3114056.

It is an arithmetic number, because the mean of its divisors is an integer number (149463648).

Almost surely, 2^1438587381 is an apocalyptic number.

1438587381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1438587381 is a deficient number, since it is larger than the sum of its proper divisors (952830987).

1438587381 is a wasteful number, since it uses less digits than its factorization.

1438587381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227672.

The product of its digits is 645120, while the sum is 48.

The square root of 1438587381 is about 37928.7144654284. The cubic root of 1438587381 is about 1128.8738567978.

The spelling of 1438587381 in words is "one billion, four hundred thirty-eight million, five hundred eighty-seven thousand, three hundred eighty-one".