12972405 has 16 divisors (see below), whose sum is σ = 20880000. Its totient is φ = 6877248.

The previous prime is 12972371. The next prime is 12972457. The reversal of 12972405 is 50427921.

It is not a de Polignac number, because 12972405 - 2⁶ = 12972341 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96 + ... + 5094.

It is an arithmetic number, because the mean of its divisors is an integer number (1305000).

Almost surely, 2^12972405 is an apocalyptic number.

12972405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12972405 is a deficient number, since it is larger than the sum of its proper divisors (7907595).

12972405 is a wasteful number, since it uses less digits than its factorization.

12972405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 12972405 is about 3601.7225045803. The cubic root of 12972405 is about 234.9669789124.

The spelling of 12972405 in words is "twelve million, nine hundred seventy-two thousand, four hundred five".