12540434 has 8 divisors (see below), whose sum is σ = 19248240. Its totient is φ = 6124356.

The previous prime is 12540433. The next prime is 12540443. The reversal of 12540434 is 43404521.

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

It is not an unprimeable number, because it can be changed into a prime (12540431) 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, 72824 + ... + 72995.

It is an arithmetic number, because the mean of its divisors is an integer number (2406030).

Almost surely, 2^12540434 is an apocalyptic number.

12540434 is a deficient number, since it is larger than the sum of its proper divisors (6707806).

12540434 is a wasteful number, since it uses less digits than its factorization.

12540434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145864.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 12540434 is about 3541.2475202956. The cubic root of 12540434 is about 232.3294096858.

Adding to 12540434 its reverse (43404521), we get a palindrome (55944955).

The spelling of 12540434 in words is "twelve million, five hundred forty thousand, four hundred thirty-four".