12940031 has 4 divisors (see below), whose sum is σ = 13935432. Its totient is φ = 11944632.

The previous prime is 12940001. The next prime is 12940073. The reversal of 12940031 is 13004921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12940031 - 2⁶ = 12939967 is a prime.

It is a super-2 number, since 2×12940031² = 334888804561922, 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 = 12939985 and 12940012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12940001) 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, 497681 + ... + 497706.

It is an arithmetic number, because the mean of its divisors is an integer number (3483858).

Almost surely, 2^12940031 is an apocalyptic number.

12940031 is a deficient number, since it is larger than the sum of its proper divisors (995401).

12940031 is an equidigital number, since it uses as much as digits as its factorization.

12940031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995400.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12940031 is about 3597.2254586000. The cubic root of 12940031 is about 234.7713544918.

Adding to 12940031 its reverse (13004921), we get a palindrome (25944952).

The spelling of 12940031 in words is "twelve million, nine hundred forty thousand, thirty-one".