12545405 has 16 divisors (see below), whose sum is σ = 16374960. Its totient is φ = 9188352.

The previous prime is 12545389. The next prime is 12545411. The reversal of 12545405 is 50454521.

It can be written as a sum of positive squares in 8 ways, for example, as 1026169 + 11519236 = 1013^2 + 3394^2 .

It is a cyclic number.

It is not a de Polignac number, because 12545405 - 2⁴ = 12545389 is a prime.

It is a super-2 number, since 2×12545405² = 314774373228050, which contains 22 as substring.

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, 1151 + ... + 5139.

It is an arithmetic number, because the mean of its divisors is an integer number (1023435).

Almost surely, 2^12545405 is an apocalyptic number.

It is an amenable number.

12545405 is a deficient number, since it is larger than the sum of its proper divisors (3829555).

12545405 is a wasteful number, since it uses less digits than its factorization.

12545405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 12545405 is about 3541.9493220542. The cubic root of 12545405 is about 232.3601039166.

Adding to 12545405 its reverse (50454521), we get a palindrome (62999926).

The spelling of 12545405 in words is "twelve million, five hundred forty-five thousand, four hundred five".