140038381 has 4 divisors (see below), whose sum is σ = 160043872. Its totient is φ = 120032892.

The previous prime is 140038369. The next prime is 140038429. The reversal of 140038381 is 183830041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183830041 = 3083 ⋅59627.

It is a de Polignac number, because none of the positive numbers 2^k-140038381 is a prime.

It is a super-2 number, since 2×140038381² = 39221496306202322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140038331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10002735 + ... + 10002748.

It is an arithmetic number, because the mean of its divisors is an integer number (40010968).

Almost surely, 2^140038381 is an apocalyptic number.

It is an amenable number.

140038381 is a deficient number, since it is larger than the sum of its proper divisors (20005491).

140038381 is an equidigital number, since it uses as much as digits as its factorization.

140038381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20005490.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 140038381 is about 11833.7813483265. The cubic root of 140038381 is about 519.2968565915.

The spelling of 140038381 in words is "one hundred forty million, thirty-eight thousand, three hundred eighty-one".