12431690 has 8 divisors (see below), whose sum is σ = 22377060. Its totient is φ = 4972672.

The previous prime is 12431689. The next prime is 12431693. The reversal of 12431690 is 9613421.

It can be written as a sum of positive squares in 2 ways, for example, as 11417641 + 1014049 = 3379^2 + 1007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12431690² = 309093832512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12431693) 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, 621575 + ... + 621594.

Almost surely, 2^12431690 is an apocalyptic number.

12431690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12431690 is a deficient number, since it is larger than the sum of its proper divisors (9945370).

12431690 is a wasteful number, since it uses less digits than its factorization.

12431690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243176.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 12431690 is about 3525.8601787365. The cubic root of 12431690 is about 231.6559133310.

The spelling of 12431690 in words is "twelve million, four hundred thirty-one thousand, six hundred ninety".