140138243 has 16 divisors (see below), whose sum is σ = 170496000. Its totient is φ = 112508352.

The previous prime is 140138239. The next prime is 140138263. The reversal of 140138243 is 342831041.

It is a Cunningham number, because it is equal to 11838²-1.

It is a cyclic number.

It is not a de Polignac number, because 140138243 - 2² = 140138239 is a prime.

It is a super-2 number, since 2×140138243² = 39277454302254098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140138213) 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, 5918 + ... + 17756.

It is an arithmetic number, because the mean of its divisors is an integer number (10656000).

Almost surely, 2^140138243 is an apocalyptic number.

140138243 is a deficient number, since it is larger than the sum of its proper divisors (30357757).

140138243 is a wasteful number, since it uses less digits than its factorization.

140138243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11954.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 140138243 is about 11837.9999577631. Note that the first 4 decimals coincide. The cubic root of 140138243 is about 519.4202649040.

Adding to 140138243 its reverse (342831041), we get a palindrome (482969284).

The spelling of 140138243 in words is "one hundred forty million, one hundred thirty-eight thousand, two hundred forty-three".