140440031 has 4 divisors (see below), whose sum is σ = 140467272. Its totient is φ = 140412792.

The previous prime is 140440019. The next prime is 140440037. The reversal of 140440031 is 130044041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130044041 = 89 ⋅1461169.

It is a cyclic number.

It is not a de Polignac number, because 140440031 - 2¹⁸ = 140177887 is a prime.

It is a super-2 number, since 2×140440031² = 39446804614561922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140439991 and 140440009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140440037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3260 + ... + 17073.

It is an arithmetic number, because the mean of its divisors is an integer number (35116818).

Almost surely, 2^140440031 is an apocalyptic number.

140440031 is a deficient number, since it is larger than the sum of its proper divisors (27241).

140440031 is an equidigital number, since it uses as much as digits as its factorization.

140440031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27240.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 140440031 is about 11850.7396815557. The cubic root of 140440031 is about 519.7928551169.

Adding to 140440031 its reverse (130044041), we get a palindrome (270484072).

The spelling of 140440031 in words is "one hundred forty million, four hundred forty thousand, thirty-one".